Cash Acme A-41 and AB-40 Pressure Regulating Boiler Feed Valve. (1/2 in.)The A 41 series pressure reducing boiler feed valve provides increased capacity for larger boilers. It has threaded female connections and an iron body with a stainless steel seat. The AB 40 series pressure reducing boiler feed valve features a brass body and a combo connection which allows either a threaded or sweat copper connection with the same union tail piece. The AB 40 also includes a check valve and provides an inbuilt bypass for rapid