McDonnell & Miller 250-3/4-30 Valve 30067439-890 The two extra wires provide

The two extra wires provide the end-switch functionality

Universal Compatibility: Serves as a drop-in replacement for STI-9620 models in existing security footprints

Common Questions When should the GF60 filter be replaced

This L185-30 switch is a standard safety control for maintaining the integrity of the furnace sequence of operation during high-static or restricted airflow conditions

McDonnell & Miller 250-3/4-30 Valve 30067439-890 The two extra wires provideThe McDonnell & Miller 250 3 4 30 (Part Number 181225) is a high capacity 3 4" NPT pressure relief valve engineered specifically for hydronic heating systems and storage tanks. Rated for a set pressure of 30 PSI and a substantial 790,000 BTU capacity, this valve provides critical over pressure protection by utilizing a fail safe spring loaded mechanism. Its heavy duty bronze body and seat, paired with an EPDM rubber diaphragm, ensure resilient