McDonnell & Miller 324500 O-Ring The Modine 5H0730570003 Blocked Vent

The Modine 5H0730570003 Blocked Vent Switch is a critical safety component engineered to monitor flue gas temperatures and prevent hazardous operating conditions

it is an OEM-level replacement for Lennox part numbers 78B72

Universal Compatibility: Fits the footprint of 15A to 75A Eaton C25 contactors and identical OEM series

Please contact our team to confirm compatibility or technical details before purchasing

A tripped manual reset switch will show an open circuit until the reset button is depressed

McDonnell & Miller 324500 O-Ring The Modine 5H0730570003 Blocked VentMaintain precise system pressure and eliminate leak paths with the McDonnell & Miller 324500 Tetraseal O Ring. This pack of five high performance seals is the engineered replacement for the discontinued 324435 part number, ensuring a direct fit without the need for field modifications. Designed as a critical boiler control replacement part, these o rings are specifically optimized for low water cut off (LWCO) and mechanical water feeder assemblies.