solid cast iron 2-stage piston series pump, oil lubricated design to extend pump life ram-tek - solid steel, heavy gauge rods, designed for maximum performance and durability cool-tek - the coolest running compressors in the industry, air stream technology provides 35% lower operating temperature flow-tek - concentric disc valves, deliver maximum air flow and reliability with low replacement costs, easily accessible design provides easy maintenance and durability industrial grade tapered roller bearings for maximum performance and extended pump life built-in head unloaders designed for continuous run applications bolt pattern: 13-1/2 in. x 6-3/4 in. 5 year parts warranty includes 3 quarts of oil pumps dimensions 14" x 27" x 27" note: emax, a division of airbase industries