Replacement AB-28 Pump for Air Boss Compressor . * Two stage Air Boss Pump * Max 175 PSI * 5 Hp. electric Motor or 9 Hp. Gas engine * 3.74" LP bore x 2.56" stroke * 15.5 CFM @ 1200 RPM * Shipping weight 66 Lbs. Go to our web site to see prices on rebuild kits for Air Boss AB-28 or AB- 30 air compressors. Go to : https://airbosscompressors.blogspot.com We have in-tank check valves, air filters , air line filters and regulators.