P143 Full-Size Residential

The BelGAS P143 is a full-size residential gas pressure regulator ideal for natural gas, air, propane, and general-purpose gas pressure regulation.

BelGAS Gas Pressure Regulator

The regulator type has an internal relief device and is available in the low-pressure cut-off – LPCO – version. The P143 uses include commercial, residential, and light industrial for burners and unit heaters and are appropriate for gases, including air, natural gas, and propane. The device can also be an LP regulator.

P143M with Internal Monitor

The P143 is now available with an internal monitor (P143M Internal Monitor). The internal monitor version has a sliding orifice and a second seat providing backup protection if the primary regulation fails. The P143M ensures continuous functionality as the monitor seat is independent of the primary seat and will still function if the primary seat is compromised. The P143M has the same form and fit as the P143.

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Features & Benefits


  • Versatile
  • Control Accuracy
  • Compact Design
  • Low-Pressure Cut-off

Model - P143
Use - Direct Operated | 7" Diaphragm | Commercial, Industrial | Partial Relief
Max Inlet  - 125 psi
Outlet Range - 3.5" WC to 6 psi | 11 ranges
Max Outlet Flow - 2,000 SCFH | Cv 0.455
Port Sizes Inches NPT - 3/4, 1, 1 1/4

Flow Ratings at wide-open flow/methane

Model - P143M - Internal Monitor version

Regulator Cross Reference

The BelGAS P143 is similar to the Itron B57, B58 and B31, Fisher CS200 and S100 (obsolete), Honeywell 1813C, and the Sensus 143-80.




  • A wide range of gaseous fluids, including air, natural gas, and propane
  • LP regulator
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