Description
Browning BK120H Sheave Freon The Watts 174A 3 4 45 is engineered The Watts 174A 3 4 45 is engineered with a bronze body and a stainless steel spring to withstand corrosive water conditions while preventing sediment accumulation near the seat—a critical safeguard against valve sticking or freezing during emergency discharge events it allows the unit to modulate firing rates based on accurate supply and return water temperature differentials