the bimetal disc has failed or the internal contacts are pitted

they are technically identical

In high-efficiency units

With a chrome-plated brass ball and a 1/2" FNPT threaded connection

When selecting a replacement relief valve

BASO K16RM-120 Thermocouple Els PW 17895 the bimetal disc has failedFor contractors requiring dependable flame supervision, the BASO K16RM 120 Thermocouple is a robust solution for standing pilot ignition systems. This 120 inch thermocouple, also known as K16RM 120H, is engineered with a nickel plated design for superior corrosion resistance and extended operational life in demanding HVACR environments. It delivers a consistent 25 35 mV open circuit millivolt range, ensuring broad compatibility with various gas fired