These pumps use a high quality cast iron housing and incorporate unitized stainless steel valves, needle bearing crank pin and large ball bearings to support the crankshaft. Crankshafts are available in a 5/8" solid shaft, for pulley or coupling drive and a 5/8" hollow shaft version for direct mounting to a standard 56 frame, 5/8" motor shaft. Piston cups are available in rubber, for water, soaps and detergents to 140 Deg. F. Teflon cups are recommended for temperatures above 140 Deg.