With a 5/8" sweat ODF connection and a maximum operating pressure of 680 PSI

it acts as a critical dampening interface that mitigates pressure surge issues caused by HVAC cycling or rapid door closures

this dry case pressure gauge is the standard choice for monitoring system pressure in boilers

the ST-D24 thermistor ensures tighter setpoint control and improved system efficiency across various air handling unit (AHU) configurations

Lennox 66J78 Limit Switch Els PW 17895 With a 5/8" sweat ODFExperienced HVAC contractors recognize the Lennox 66J78 Limit Switch as a critical safety component for maintaining furnace integrity and preventing heat exchanger damage. This OEM Lennox replacement part is a 36T series disc style control designed for High Limit or Secondary Rollout applications. It features a Normally Closed (NC) circuit that opens on temperature rise to interrupt the heating cycle if internal temperatures exceed safe operating