Armstrong B4 1 in NPT Float & Thermostatic Steam Trap, 15 PSIG PMO

Armstrong's B and BI Series float and thermostatic steam traps are made for heating service that needs continuous drainage and high air-venting capacity. The thermostatic air vent is charged to track the steam pressure-temperature curve from 20 inches of vacuum to 30 psig, venting air slightly below steam temperature across that range.

Part D1175-3 is the Armstrong B4 in 1 in NPT, rated 15 psig maximum operating pressure.

Manufacturer documentation: data sheet, installation and maintenance manual.