Conbraco 18C-521-5-150 Valve Els PW 17895 Durable Construction: Heavy-duty housing and

Durable Construction: Heavy-duty housing and 1/8" NPT threads withstand professional-grade installation torques

Professionals can switch between 0-20 psig and 3-15 psig output ranges instantly

Stable 24V Logic: Designed specifically for 1 pole fan control to maintain consistent 24VAC signal integrity

Common Questions What causes a furnace pressure switch to stay open

Common Installation & Operation Questions:

Conbraco 18C-521-5-150 Valve Els PW 17895 Durable Construction: Heavy-duty housing andThe Conbraco 18C 521 5 150 is a high capacity ASME Section IV certified primary safety device engineered for commercial hot water storage tanks and large scale heating systems. Designed to prevent catastrophic vessel failure, this 1" MNPT x 1" FNPT temperature and pressure relief valve provides a 2,155,000 BTU hr capacity, making it a standard for mechanical contractors servicing high output boilers. The valve is factory set to open at 150 PSI or