Cylinder dimension: Inside Diameter: 2.365 inch; Outside Diameter: 2.495 inch; Outside Shoulder: 2.945 inch; Total Height: 1.980 inch K-0650 Compression Ring Kit for Black and Compressor The K-0650 Cylinder and Piston Ring Replacement kit fit both the single cylinder oil-free pumps and the twin cylinder oil-free pump made by , , , Snap On, , Air America, Charge Air Pro, Grainger, & Replace Part Number: K-0650, Manufacturer: Mcnhbdgg