Quality and industrial durability are built into each cast iron pump to give you a solid return on your compressor investment. Engineered to last – heavy cast iron construction. Serious protection – comes standard with ductile iron crankshafts, high strength metal connecting rods, rod insert bearings, wrist pin bushings, high-capacity hardened and lapped stainless steel valves with suction valve head unloaders. Efficiency – maximum CFM output per energy dollar. STANDARD FEATURES: Splash lubricated Cast iron crank case Heavy duty ductile iron crankshaft Dynamically balanced flywheel Cast iron cylinders Large intake filter with silencers Heavy duty connecting rods Suction valve head unloader Large main roller bearings Intercooler with radiating fins Oil sight glass