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For larger pipe diameters
The standard GM40AV model is a synchronous drive unit
it is recommended to verify if additional flange gaskets (like the 100483 series) are required for your specific furnace model during the swap
the size 04 is generally rated for nominal capacities in the 0
it eliminates the guesswork of universal seals that fail under thermal expansion
McDonnell & Miller 247-2 Water Feeder R-410A For larger pipe diametersThe McDonnell & Miller 247 2 (Part Number 133800) is a heavy duty mechanical water feeder specifically designed for steam and hot water boilers requiring consistent cold water makeup. This unit features a built in No. 2 Switch, providing integrated Low Water Cut Off (LWCO) functionality with two snap acting SPDT switches. This configuration ensures that if the water level drops below a safe threshold, the burner circuit is interrupted while
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