These 100% new, high performance mechanical fuel pumps were designed & built to feed multi-carb setups. Works well with any Offenhauser flathead Ford intake manifold. Heavy duty diaphragm. 1/2"-20 Inlet/Outlet. Rugged alloy casting for durability. Heat-treated rocker arm. Works with original Ford-style lines (compression nut & sleeve) Includes gasket. Item Details1/2"-20 Inlet/Outlet.