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Model 143

The Model 143 models are built to perform. They feature precise pressure control, as well as outstanding performance and dependability. These gas regulators are also available with a low-pressure cut-off. 

The Model 143 regulators are used for both residential and small commercial and industrial applications, such as burners, furnaces, ovens, heaters, gas engines and others.

They are available with a variety of body sizes, loading springs and orifice sizes. These compact regulators also provide the outlet pressure ranges and the capacities to fit most applications for a 6″ service diaphragm regulator. 

Benefits & Features

The Model 143 offers smart features, including an internal relief valve and a union nut connection, which does not require bolts or screws to connect the body to the diaphragm assembly. This enables the regulators to be set in virtually any position for excellent field versatility. They are simple, rugged and precise regulators that deliver the results you desire.


Installs in numerous mounting positions


Delivers precise pressure control


Low-pressure cut-off available


Internal relief valve available


Seven outlet pressure ranges

Technical Data

Model 143-80
Valve BodyCast Iron – 125 psig working pressure
Spring and Lower CaseDie-Cast Aluminum
Fulcrum PinStainless Steel
Valve SeatOne piece molded Buna-N
Valve StemFiberglass reinforced nylon
Throat/Support/StemAcetal insert
Diaphragm PlatePlated Steel
DiaphragmNylon fabric-reinforced Buna-N with full 26in² effective area
Vent and ValvePolyethylene valve and seat, 1″ NPT vent
Operating Temperature-20° to +150° F (-28.9° to +65.5° C)
Corrosion ProtectionCases dip primed chromate conversion coating, enamel topcoat
Internal Relief ValveSet to relieve at approximately 7-10″ w.c. above normal outlet pressure setting