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replacing them if they show signs of thermal fatigue or compression set
For direct burial
While light soot can be brushed off
Simplified Wiring: Features integrated 18-inch leads and a conduit connection for code-compliant installations
Use a multimeter to check for continuity across the leads when the coil temperature is below the switch’s closing setpoint
Watts 0275404 Valve 319852-301 replacing them if they showThe Watts 0275404 is a high capacity boiler pressure relief valve from the Series 174A, engineered specifically for hot water heating and domestic supply systems. This 1 inch NPT threaded valve is designed to handle demanding commercial and industrial hydronic loads, featuring a discharge capacity of 3,215,000 BTU hr at a 125 PSI pressure relief setting. Built with a rugged bronze body and a stainless steel spring, it utilizes a non metallic, soft