Oil Free Medium Pressure have Forged Crank Shaft & Connecting Rod, Precision Main & Crank Pin Bearings with force feed lubrication have very high load bearing capacity & hardly needs replacements. Low RPM & rugged cast iron design ideal for heavy duty continuous 24 x 7 operating year after year. Cylinders constructed with large cast in water jackets & specially designed intercoolers for dimensional stability & better cooling under continuous operation.