this adjustable pressure switch is rated for use with most non-corrosive HFC and HCFC refrigerants

FVIR Compatibility: Designed for use in Flammable Vapor Ignition Resistant systems to maintain safety compliance

Secure Splined Connection: Specifically notched for 1/2" splined shafts to prevent the linkage from slipping under high-static pressure loads

The flush-mount configuration is engineered for exterior wall installation

Watts 0275825 Valve 318172-701 this adjustable pressure switch isThe Watts 0275825 (Series 174A) is a high capacity ASME Section IV boiler pressure relief valve designed specifically for hot water space heating applications. Engineered for rugged performance in commercial and residential hydronic systems, this 1 1 4" NPT valve is factory set at 75 PSI to provide reliable overpressure protection. With a high volume discharge capacity of 3,429,000 BTU hr, it ensures system integrity during thermal expansion or