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The McDonnell & Miller 304400 is a genuine replacement flow switch cover (Model FS4-3COV) engineered specifically for Xylem FS4-3 liquid flow switches and the AF-1
036-inch drill size required for specific BTU outputs in Nordyne gas furnaces
Industrial-Grade Build: Constructed with high-quality PCB materials capable of handling the high-heat cycles typical of Raypak heating systems
meaning it will re-engage the heating circuit once the temperature falls below its 40°F differential point
Laars Heating Systems V0079100 Gas Valve 320788-703 The McDonnell & Miller 304400The Laars Heating Systems V0079100 Gas Valve is an essential OEM replacement component engineered for high performance 2 stage propane (LP) boiler and heating systems. Designed for precision fuel regulation, this 3 4 inch NPT gas valve operates on a 24 VAC control circuit, ensuring seamless integration with existing hydronic controls. As a veteran grade solution, it features a factory set 4" WC outlet pressure to optimize combustion efficiency in dual
