depot pull
Pay in 4 interest-free payments of $11.66 Learn more
Ships within 48 hours · Estimated delivery Sep 15 - Sep 20
replacing HH12ZA178 and HH12ZA178A exactly
The bimetal sensing element is tuned to open the electrical circuit at 150°F to prevent heat exchanger damage and close at 110°F once temperatures return to a safe operational threshold
the tube should extend at least 2/3 across the duct width to ensure a proper air sample is captured
312 inches before installation
it includes a second-generation anti-explosion safety switch to prevent catastrophic failure under high-pressure conditions
Watts 0342691 Relief Valve replacing HH12ZA178 and HH12ZA178A exactlyThe Watts 0342691 (Model 335M2) is a high capacity boiler pressure relief valve engineered for hydronic heating systems and low pressure steam applications. Featuring a 3 4" female NPT inlet and 3 4" female NPT outlet, this ASME Section IV rated safety valve is factory set to 30 PSI, providing critical overpressure protection for residential and light commercial boilers. With a steam discharge capacity of 510,000 BTU hr, it serves as the direct
US$ 1557.50
US$ 124.01
US$ 675.00
US$ 49.28
US$ 500.00
US$ 103.50
US$ 67.78
US$ 2512.50
US$ 2272.50
US$ 1922.50
US$ 2215.00