This "A" Valve fits Meyer E-46, E-47, E-57, and E-60 plow pumps. It has a 5/8" Diameter stem. It is the larger A Valve used on newer units listed above. IF you buy a 5/8" Coil AND Valve, it is a direct replacement/upgrade for the 3/8" A Coil AND Valve. MADE IN USA. The A Valve controls "Lower and Float". For optional Brass Nut click on Related Items tab. More important info on A Valves here: Meyer A Coils and Valves.