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  • Twin Stage Regulator

Low Pressure Propane Regulators - Preset, First Stage, Second Stage, and Twin Stage  

Gas grills up to about 50,000 btu/hr most often use low pressure propane which requires a low pressure propane regulator. Low pressure gas can be natural gas (natural gas normally does not require further pressure regulation), or propane piped into a trailer home or RV, or a conventional home in which the gas has already been adjusted to a 6 ounce (10.5 WC inches) low pressure at the propane source.   Preset low pressure propane regulators are set at 6 ounces.    {Handy conversions:  1" WC = 0.036127 psi , 16 oz. = 1 pound}   We ship everywhere in the world...and the shipping is free to the 48 contiguous US states.


How are the GasHosesandRegulators.com low pressure gas regulators any different than what is customarily sold at Home Depot, Lowe's, or from those included as original equipment with most gas grills?    

GasHosesandRegulators.com  sells the M.B. Sturgis brand of low pressure regulators designed with 3/8" ID gas regulator outlets and 3/8" ID grey, AGA-approved gas hoses rather than the customary regulators with 1/4" ID gas outlets and with 1/4" ID black hoses.  The 1/4" ID type are usually found on most backyard gas grills or are offered for sale at the Depots as replacement equipment. A larger gas regulator outlet ID of 3/8", going all the way from the regulator to the appliance permits an amazing increase in delivery of 2.25 times the VOLUME of gas to your appliance!  

These are preset regulators so you can't change the pressure, but you can change the volume of gas available to your appliance if it needs it.  So, if you think your low pressure gas appliance is just not getting enough gas, the problem could be the diameter size of the regulator output and the hose delivering the gas.  A regulator with a 3/8" ID diameter gas regulator outlet and a 3/8" ID grey hose is going to it make a lot more gas available to the appliance.  Upgrade.  Don't starve your grill of fuel!   You still control the amount of gas used in the same manner, i.e., with the gas control knob on your appliance.

 

204039 - GREEN ACME Inlet Tank Fitting

  204039

204039 - GREEN ACME, Type One Inlet safety tank fitting, is a wrench-less, user friendly, right hand tank connector with excess flow prevention and a thermally sensitive sleeve bushing. 

200,000 btu/hr maximum output.  1 5/16" ACME x 1/4" M NPT. Designed for low pressure propane regulators (our COM5 series regulators, and other low pressure hoses and fittings).  Perfect  for use with most gas grills and other low pressure devices. Installation requires use of an 11/16" socket, preferably 6 point. Order one and we will install it on the low pressure regulator you order.  No installation charges.   Pictured below, for example, is a Green ACME inlet installed on a COM5 regulator assembly.


Why order a Green Acme tank fitting for your regulator?  

A Green Acme Type I tank fitting will screw into practically any propane tank except some of the very large 100# propane tanks.  You tighten it up clockwise using your hand.  It does not require the use of a wrench! Most folks find that very handy. It has safety features of excess flow prevention, which means if there is a major leak, the internal spring inside the Acme fitting will shut off the flow of the gas.  It also has a thermal sensitive sleeve bushing.    When this sleeve bushing is exposed to temperatures over 240 ºF, it will melt and allow a brass nipple inside the nut to shift about 1/4". The forward movement of the nipple will close a small piston inside the cylinder valve and all propane gas will stop flowing.   The Green Acme protects you and your family.



Wt. 1#.  Free shipping within the 48 contiguous U.S. States.

  • Green Acme Safety Tank Fitting on Low Pressure Regulator
    Green Acme Safety Tank Fitting on
    Low Pressure Regulator
  • Green Acme Tank Fitting
    Green Acme Back Side
  • Green Acme Front Side

$12.00

 

 

MANC - Manual Tank Changeover Valve Assembly

  MANC

MANC - Manual Tank Changeover Valve Assembly includes (2) - 24" high pressure thermoplastic hoses and Green Acme Type One wrench-less tank connectors with back flow prevention.   Valve is 1/4" ID female inverted flare x 1/4" ID female inverted flare x 1/4" male NPT.

How does a Manual Tank Changeover Valve Assembly work?

 
The changeover valve will screw into any high pressure or low pressure propane regulator.   When one tank is empty, just turn the yellow lever to the full tank.  Then close the tank valve on top of the empty tank, unscrew that Green Acme, and you are free to remove the empty tank for replacement. This is a very simple solution to a nagging problem of running out of gas at the wrong time.


MANC-SS option is the same as the MANC but has two 24" high pressure thermoplastic hoses with a protective Stainless Steel Overbraid .  The added feature of the Stainless Steel Overbraid makes the 24" hoses very strong and practically impervious to squirrels and other gnawing rodents. Preferred by professional caterers.  (The red pressure regulator and attached gas outlet hose shown in the example are NOT included.)

(POL's propane tank connectors instead of the Green Acmes are available.)
                                                  
Wt.1# 12 oz.  Free shipping within the 48 contiguous U.S. States.

  • MANC with Stainless Steel Overbraid Hoses
    MANC-SS
  • Manual Tank Changeover Valve Assembly
    MANC attached to a
    COM5 Low Pressure Regulator
  • Manual Tank Changeover Valve Assembly
    MANC Assembly ready
    for attaching to a regulator
  • Manual Tank Changeover Valve Assembly with POL's tank Fittings
    MANC with POL's
  • Manual Tank Changeover Valve Assembly with POL's tank Fittings and SS Hoses
    MANC-SS with POL's

 

$49.95

 

 

COM-AC - Dual Tank Auto Changeover Low Pressure Regulator

  COM-AC

COM-AC   Low Pressure automatic changeover regulator with:  (2) - model 100575-24  24" x 1/4" ID, 350 psi thermoplastic tank hoses and Green ACME tank fittings x 1/4" inverted flare with safety back-check inlet fittings, and (1) - 5' x 3/8"ID UL approved AGA low pressure gas outlet hose x 3/8" SAE F gas flare swivel fitting.  Longer length Low Pressure AGA outlet hoses (and in Stainless Steel overbraid) are available.  Includes mounting bracket.

How does an Automatic Changeover Low Pressure Regulator work?

This is the ultimate solution to avoid running out of gas.  Regulator automatically switches from the empty propane tank to the full reserve tank, ensuring a continuous gas flow.  The color of the dial changes from a highly visible green to red signaling that the  first cylinder is exhausted while the valve automatically changes to the remaining full tank. Rotation of the handle to the full cylinder will restore the green color on the indicator.  The built in safety back check permits one to change out the empty tank while the full tank is operational.



160,000 btu/hr maximum output.  1/4" female inverted flare inlets x 3/8"ID female NPT outlet, complies with UL144 and NFPA 1192 requirements for use with recreational vehicles.  RVIA required regulator plastic cap cover included (regulator alone without cap is shown below).   With integral mounting bracket shown below which is convenient to mount to a post or a 2" x 4" block.

Wt. 7#.   Free shipping within the 48 contiguous U.S. States.

  • Dual Tank Auto Changeover Low Pressure Regulator
    COM-AC Dual Tank Autochangeover Low Pressure Regulator
    with (2) 24" High Pressure Tank Hoses and Green Acme
    Safety Tank Connectors with Back Check Flow Prevention
  • Dual Tank Auto Changeover Low Pressure Regulator
    COM-AC with Optional 3/8" ID
    Stainless SteelOverbraid outlet hose

 

$134.95

 

 

COM-AC-SS - Dual Tank Auto Changeover Low Pressure Regulator with Stainless Steel Overbraid TANK hoses

  COM-AC-SS

COM-AC-SS - Dual Tank Automatic Changeover Low Pressure Regulator with (2) - 24" Stainless Steel Overbraid  high pressure tank hoses (350 psi max) and Green ACME tank fittings x 1/4" inverted flare with safety back-check inlet fittings, and a (1) - 5' x 3/8"ID UL approved AGA low pressure gas outlet hose x 3/8" SAE F gas flare swivel fitting.  Optional longer length Low Pressure AGA outlet hoses (and in Stainless Steel overbraid) are available.  Includes mounting bracket.


Why order the COM-AC with Stainless Steel Overbraid TANK Hoses?

Stainless Steel Overbraid installed over the M.B. Sturgis strip wound low pressure gas hose makes the hose almost impervious to rodents and squirrels.  These critters have an acute sense of smell and when they smell natural gas or propane it sends them into a "gnawing frenzy".  If you plan to hook up your COM-AC to your propane tank on a semi-to-permanent basis and you live in an area known to have squirrels, you might want to consider the Stainless Steel Overbraid option.  It just might save you from having to replace the hoses hooked to your supply tank.


Regulator with 3 hoses shown at right.  Switches from the empty propane tank to the full reserve tank, ensuring a continuous gas flow.  The color of the dial changes from a highly visible green to red signaling that the  first cylinder is exhausted while the valve automatically changes to the remaining full tank. Rotation of the handle to the full cylinder will restore the green color on the indicator.  The built in safety back check permits one to change out the empty tank while the full tank is operational.

160,000 btu/hr maximum output.  1/4" female inverted flare inlets x 3/8"ID female NPT outlet, complies with UL144 and NFPA 1192 requirements for use with recreational vehicles.  RVIA required regulator plastic cap cover included (regulator alone without cap is shown below).
   

With integral mounting bracket shown below which is convenient to mount to a post or a 2" x 4" block.  This is the ultimate solution to avoid running out of gas.   Also available with OPTIONAL longer Low Pressure AGA gas service hoses (see options listed at right).

Wt. 7#.   Free shipping within the 48 contiguous U.S. States.

  • Dual Tank Auto Changeover Low Pressure Regulator with SS hoses
    COM-AC-SS Dual Tank Auto Changeover Low Pressure
    Regulator with (2) 24" Stainless Steel High Pressure Hoses
    with Green Acme Safety Tank Connectors with Back Check
    Flow Prevention and a 3/8" ID SS Overbraid outlet hose
  • Dual Tank Auto Changeover Low Pressure Regulator with SS hoses
    COM-AC-SS with Optional 3/8" ID
    strip wound outlet hose

 

$164.95

 

 

COM5 - Low Pressure PRESET Regulator

  COM5

COM5 - Low Pressure PRESET  regulator (6 oz, 11" WC),
POL tank fitting, and a 3/8" ID UL approved AGA hose with 3/8" F SAE gas flare swivel connection. 


160,000 btu/hr maximum output.

►   Green Acme wrench-less safety tank connector is available
       as an Option at an additional charge.


Wt.1#.   Free shipping within the 48 contiguous U.S. States.

 

$39.95

 

 

COM5-UL - Low Pressure PRESET Regulator with UL Approved Ball Valve

  COM5-UL

COM5-UL - Low Pressure PRESET  regulator (which reduces the tank pressure to (6 oz, 11" WC), POL tank fitting, UL approved ball valve for positive shut off, and a 3/8" ID UL approved AGA hose with 3/8" F SAE gas flare swivel connection.

160,000 btu/hr maximum output.

►   Green Acme wrench-less safety tank connector is available
       as an Option at an additional charge.


Wt. 6#   Free shipping to the 48 contiguous U.S. States.

 

$48.95

 

 

COM5-GRN  - Low Pressure, High Output, PRESET Regulator, with Green Acme Tank Fitting

  COM5-GRN

COM5-GRN  -  Low Pressure, high output PRESET regulator
(
6 oz, 11" WC) with a GREEN Acme tank fitting, 3/8" ID UL approved AGA hose with 3/8" F SAE gas flare swivel end. Other hose lengths available 10ft, 12ft, 15ft, 20ft and in Stainless Steel overbraid.

■   160,000 btu/hr maximum output, for low pressure applications
    requiring higher gas volume output. 

■   The Green Acme is a wrench-less, right hand tank connector
    with excess flow prevention and a thermally sensitive sleeve.


Wt. 5#.  Free shipping to the 48 contiguous U.S. States.

 

$51.95

 

 

COM5-GRN-UL - Low Pressure, High Output, PRESET Regulator with GREEN Acme Tank Fitting

  COM5-GRN-UL

COM5-GRN-UL  - Low Pressure, high output PRESET regulator
(6 oz, 11" WC), Green Acme Type I tank fitting, UL approved ball valve
for positive shut off, and a 3/8" ID UL approved AGA hose with
3/8" F SAE gas flare swivel connection. 


■   160,000 btu/hr maximum output, regulator and hose designed for
    low pressure applications requiring higher gas volume 
output.
■   UL-approved ball valve for positive shut-off. 
■   Green Acme safety fitting enables wrenchless tank connections
    by hand tightening only.
 

Wt. 2#.  Free shipping to the 48 contiguous U.S. States.

 

$60.95

 

 

COM5-D  Low Pressure PRESET Regulator Dual Hose Combo

  COM5-D

COM5-D - Low Pressure PRESET regulator (6 oz, 11 " WC), two ball valves for control of gas through each hose, POL tank fitting and two 3/8" ID UL approved AGA hoses, each with 3/8" F SAE gas flare swivel connections. 

160,000 btu/hr maximum output.

►   Green Acme wrench-less safety tank connector is available
       as an Option at an additional charge.


Wt. 3#.   Free shipping within the 48 contiguous U.S. States.

 

$69.95

 

 

COM5-D-GRN - Low Pressure PRESET Regulator Dual Hose Combo,with Green Acme Tank Fitting

  COM5-D-GRN

COM5-D-GRN - Low Pressure PRESET regulator (6 oz, 11 " WC), two ball valves for control of gas through each hose, POL tank fitting and two 5 ft, 3/8" ID UL approved AGA hoses, each with 3/8" F SAE gas flare swivel connections, with a Green Acme tank fitting.

160,000 btu/hr maximum output. 

Wt. 3#.   Free shipping within the 48 contiguous U.S. States.

 

$81.95

 

 

GR9450 - Compact Low Pressure Twin Stage Regulator

  GR9450

GR9450 -Twin Stage Regulator combines first and second stage regulators into a single compact unit.  Gas inlet is a standard model 204051 Full Flow tank connector with a soft nose POL. Outlet connection is 1/2" FNPT.   Two styles of mounting brackets are included. Hose is not included.

400,000 btu/hr maximum output.  Designed to reduce tank pressure down to a preset 11" WC delivery pressure.  Manually adjustable from 9 to 13" WC.   This model is unusual in that it will maintain 8.5" WC even in the harshest cold environments.  In very cold weather many regulators will not maintain this basic operating pressure because the tank pressure is so low. The compact design makes it the ideal choice for small domestic applications requiring higher gas volumes than available from normal low pressure preset regulators.  Flexible 1/2"ID low pressure outdoor gas hoses for the outlet are found on our Natural Gas Hose webpage. Two styles of mounting brackets are included. Dimensions are: 7.5"L x 4.25"W x 3.25"H 

Why use a twin stage regulator?  

The first stage of a twin stage low pressure regulator brings the unregulated tank pressure down to a constant 10 psi.  This helps the second stage regulator maintain a nearly constant 11" WC gas delivery to your appliances.  These dual stage type regulators are required by Federal code on all RV's.  They compensate for the varying tank pressures inside the propane tank and insure an even pressure on the delivery side regardless of the varying demand for gas.  This method of low pressure regulation has an added benefit of greatly reducing the possibility of freeze-ups, which would otherwise likely occur more frequently as the btu/hr demand increases.  400,000 btu/hr maximum output.   


Wt. 1# 13.4 oz.   Free shipping within the 48 contiguous U.S. States.

  • Twin Stage Regulator
    with Mounting Brackets
    (Which are included with Regulator)
  • Twin Stage Low Pressure Regulator with Optional Red Acme Safety Tank Connector
    (GR9450-Red Acme)
    Twin Stage Low Pressure Regulator with
    Optional Red Acme Safety Tank Connector
  • (GR9450-MANC)
  • (GR9450-MANC-POL)
  • GR9450 with OPTIONAL MANC Manual Propane Tank Changeover Valve with
    Red Acmes or POL's to avoid running out of gas
  • (GR9450-MANC-SS-POL)
  • (GR9450-MANC-SS)
  • GR9450 with OPTIONAL MANC-SS Manual Propane Tank Changeover Valve with
    Red Acmes or POL's to avoid running out of gas

 

$89.50

 

 

GR9412 - Low Pressure Twin Stage Regulator

  GR9412

GR9412 - Low Pressure Twin Stage Regulator includes  a 60" thermoplastic high pressure hose with a model 204051 Full Flow, POL tank connector, and a GR-905 mounting bracket.  Gas outlet is 3/4" FNPT.  
 
525,000 btu/hr maximum output.   Twin stage regulators combine first and second stage regulators into a single unit. They are designed to reduce tank pressure to a preset 11" WC delivery pressure.  Manually adjustable from 9" to 13" WC.  Equipped with 1/8" FNPT pressure gauge taps on inlet and outlet for easy system pressure checks.  Flexible 3/4" ID low pressure Outdoor gas hose for the outlet may be found on our Natural Gas Hose webpage.  

Higher propane gas volumes which are perfect for small cabins using portable tanks.525,000 btu/hr maximum output.
Dimensions: 7.5"L x 5.5"W x 4.75"H.  

Wt. 3# 15 oz.   Free shipping to the 48 contiguous U.S. States.

  • Twin Stage Regulator with
    905 Universal Mounting Bracket
    (Which its included with Regulator)
  • GR9412 - Low Pressure Twin Stage Regulator with SS Hose
    (GR9412 - 5ft SS Hose)
    Twin Stage 525,000 btu/hr Low Pressure Regulator
    with Optional Stainless Steel Overbraid Hose
  •  
    GR9412 with OPTIONAL MANC Manual Propane Tank Changeover Valve with
    Red Acmes or POL's to avoid running out of gas
  •  
    GR9412 with OPTIONAL MANC-SS Manual Propane Tank Changeover Valve with
    Red Acmes or POL's to avoid running out of gas

 

$132.50

 

 

GR905 - Universal Mounting Bracket

  GR905

GR905 - mounting bracket will work with all of the dual stage and twin stage gas regulators except the GR9450.   Dimensions: 1.25" x 9".

Wt. 2.7 oz.  Free shipping to 48 contiguous U.S. States.

  • Mounting Bracket

$6.75

 

 

GR9189212 - First and Second Stage Low Pressure Assembly

  GR9189212

GR9189212 - First Stage and Second Stage Low Pressure Custom Assembly mounted on a 12" x 12" x 1/8" aluminum panel with 1/4" mounting holes in each corner.    The gas outlet is 3/4" FNPT.    950,000 btu/hr maximum output. 
GasHosesandRegulators.com has fabricated a complete assembly including a 60" x 1/4"ID high pressure thermoplastic rubber hose outfitted with a 204051 Full Flow POL tank connector.  The two regulators are pre-mounted on a 12" x 12" aluminum panel.   The panel has 1/4" diameter holes in each corner for easy installation.   Dimensions: 12"L x 12"W x 5"H. 

Why would someone want the First Stage and Second Stage Regulators pre-mounted and pre-plumbed on a panel?

A First Stage and Second Stage Custom Assembly which is already plumbed together may be very convenient for situations where you intend to have a portable propane tank close to the house or very near a propane fueled generator.  Also, for use with stand-alone, higher Kilowatt emergency generators which rely on larger volumes of propane from portable tanks.  

The large capacity first stage regulator (RED) pictured at right is factory set at 10 psig.  It is equipped with an integral relief valve and built-in 1/8" FNPT pressure gauge tap.   The adjustment range, (normally not necessary), is 5-10 psig.  Output capacity is 2,500,000 btu/hr.  The second stage regulator (GREY) pictured at right is factory set at 11" WC.  The adjustment range is 9 to 13" WC.   It is also equipped with an integral relief valve and a built-in 1/8" FNPT pressure gauge tap.  

Everything is already plumbed together and all you have to do is mount it on a vertical surface with the two relief valves facing down.   (The black relief valves are shown at the bottom in the picture at the right.)    The outlet threads on the Grey second stage regulator are 3/4" FNPT so either use 3/4"ID pipe or you can use flexible 3/4"ID low pressure gas hose at the outlet.   Low Pressure Outdoor gas hose for the gas outlet may be found on our Natural Gas Hose webpage.  
950,000 btu/hr maximum output. 



Wt. 10# 9.6 oz.  Free shipping within the 48 contiguous U.S. States.  

$275.00

 

 

GR918 - First Stage High Pressure Regulator

  GR918

GR918 - First Stage High Pressure Regulator factory set at 10 psi. Includes model 204051 Full Flow POL tank connector. Gas outlet is 1/2" FNPT. Includes GR-905 mounting bracket.  2,500,000 btu/hr maximum output.

Why use a First Stage and Second Stage Regulator Separately?

When the large supply tank is installed a long distance from the point of use of the gas, then installation of the First Stage (high pressure) Regulator separately from the Second Stage (low pressure) Regulator may be advantageous in order to avoid noticeable pressure drops in the gas delivery downstream.


The large capacity first stage regulator (RED) pictured at right is factory set at 10 psig.  The adjustment range, (normally not necessary), is 5-10 psig.  It is equipped with an integral relief valve and built-in 1/8" FNPT pressure gauge tap.    Outfitted with a #204051 Full Flow POL tank connector which has 1/4" MNPT inlet.   Gas outlet is 1/2" FNPT.   Supplied with GR-905 mounting bracket, pictured below.  2,500,000 btu/hr maximum output. Dimensions:   8.75"L x 5.5"W x 4.75"H,

Wt. 3# 3.9 oz. 
  Free shipping within the 48 contiguous U.S. States.

$102.75

 

 

GR9212 - Second Stage Low Pressure Regulator

  GR9212

GR9212 - Second Stage Low Pressure Regulator factory set at 11" WC. Gas inlet is 1/2" FNPT and the gas outlet is 3/4" FNPT. 950,000 btu/hr maximum output.   

A Second Stage Regulator is not designed to work directly with tank pressure.  It must be used in conjunction with a First Stage Regulator.  

The second stage regulator (GREY) pictured at right is factory set at 11" WC.  The adjustment range is 9 to 13" WC. It is also equipped with an integral relief valve and a built-in 1/8" FNPT pressure gauge tap.    Inlet connection is 1/2" FNPT. Outlet connection is 3/4" FNPT.  Low pressure outlet gas hose may be found on our Natural Gas Hose webpage.  Supplied with GR-905 universal mounting bracket, pictured below.  
950,000 btu/hr maximum output.  Dimensions: 7.25"L x 5.5"W x 4.75"H.

Wt. 2# 14.7 oz.  Free shipping within the 48 contiguous U.S. States.

$107.25

 

 

WC - Ashcroft Low Pressure Test Gauge

  WC

WC - Ashcroft Low Pressure Test Gauge, measures from 0 to 15" WC.  

All of the Dual Stage and Twin Stage Low Pressure Regulators in this section have 1/8" FNPT test port outlets.  This gauge is supplied with an 1/8" MNPT fitting.

We recommend that this gauge only be used by a licensed plumber or certified gas technician.  It is a sensitive, accurate test gauge, fabricated with a beryllium copper diaphragm and a brass socket and must be used correctly.  Test gauges are not returnable.  Dial face is 2.5".  Height 4 3/8".

Wt. 5.6 oz.  Free shipping within the 48 contiguous U.S. States.


  • Ashcroft Low Pressure Gauge
    Ashcroft Low Pressure Test Gauge
  • Ashcroft Low Pressure Gauge
    Rear View of Gauge

$96.50

 

 

NGR-243-8HP - Sensus Natural Gas Regulator 246-8 High Pressure

  NGR-243-8HP

NGR-243-8HP - Sensus Natural Gas Regulator 246-8 High Pressure

● The Sensus Natural Gas 243 Regulator is a commercial industrial
    service regulator with a large capacity and is designed for a wide
    range for commercial, industrial and gas distribution applications.
    Itis ideal for pressure factor measurement, pressure compensated
    metering, fixed-factor billing and more. Its smart design offers
    great field versatility. With a union connection between the fully
    interchangeable body and the diaphragm case, this regulator
    is easy to install, adjust and service in all piping arrangements.

● This large capacity service regulator is designed and built for
    commercial, industrial, and gas distribution work.


● The regulator 243 is used for all kinds of gas fueled equipment
    such as boilers, burners, furnaces, ovens, heaters and etc.

●  For Natural Gas use Only.


●  We only have (3) of these regulators remaining in stock, priced
    individually at $250.00 or $675.00 for all three. Call 713.222.0077
    to obtain this reduced price, if you wish to order all three.

●  This item is not eligible to be returned or exchange.


Description:
● 2" ID Inlet and Outlet (2" SCRD)
● Inlet Pressure 10-40 PSI
● Outlet Pressure 4-10 PSI
● Orifice 3/4" - 10°

● Made in U.S.A. (Regulators are manufactured by SENSUS)

Model 243 Specification Sheet

Model 243 Service Regulator Sheet



Wt. 22#.  Free shipping of any quantity to the 48 contiguous U.S. States.

 

$250.00

 

 

Our propane regulator specialists are here to help you.  Call:  713 222 0077.  We have a low pressure propane regulator for almost any situation.