This 8-inch

The Watts 0342692 (Model M335M2) is a heavy-duty 3/4" boiler pressure relief valve engineered for hydronic heating systems and low-pressure steam applications

it restores connectivity once temperatures normalize

this 10k Type 2 thermistor facilitates tight control over outdoor air resets and mechanical cooling strategies

Watts 0556031 Valve This 8-inchThe Watts 0556031 (Model LFN36M1 3 4) is a heavy duty 3 4 inch lead free vacuum relief valve designed to protect water heaters and supply tanks from atmospheric pressure imbalances. Formerly cataloged under part number 0138458, this updated lead free version is vital for preventing vacuum conditions that siphon water away, which can lead to heater burnout or catastrophic tank collapse. This valve is engineered with a low profile design and a durable