McDonnell & Miller 250-1-30 Valve 30067439-890 The internal contact block is

The internal contact block is factory-sealed to maintain high contact force until the precise break point

Does this assembly include the door latches

Durable Construction: Engineered with premium thermal insulators to prevent electrical bypass and maintain probe integrity under heavy duty cycles

Universal Compatibility: Replaces older Lennox and Allied Air part numbers including 86H3101

the 100208553 sensor must be swapped

McDonnell & Miller 250-1-30 Valve 30067439-890 The internal contact block isFor high performance hydronic heating systems, the McDonnell & Miller 250 1 30 (Part Number 181925) is a heavy duty 1" NPT pressure relief valve engineered to protect ASME Section IV pressure vessels. This bronze body relief valve is factory set at 30 PSI and provides a substantial 1,170,000 BTU capacity to prevent over pressure conditions in large scale boiler applications. Designed for maximum durability, it features an EPDM rubber diaphragm and