A. The K - 0650 cylinder and piston ring replacement kit is suitable for single - cylinder oil - free vacuum pumps and double - cylinder oil - free vacuum pumps produced by companies such as Sears, Snap On, Air America, Charge Air Pro, Grainger, & Decker, etc. B. K - 0650 compressor compression ring kit C. Cylinder dimensions: Inner diameter 2.365 inches; Outer diameter 2.495 inches; Outer shoulder 2.945 inches; Height 1.980 inches D. Replacement part number: K - 0650 E. Material: Metal + Plastic F. Color: Silver G. Package contents: - 1 D25837 coated cylinder liner - 1 DAC coated oil - free ring - 1 SSF - 3158 - 1 connecting rod cap bolt - 1 - 8156 O - ring between the valve plate and the cylinder liner - 1 ACG - 45 O - ring between the cylinder head and the valve plate H. Only the above package contents are included, and other items are not included. I. Note: Light and different monitors may cause slight differences between the color of the item in the picture and the actual object. The allowable measurement error is +/- 1 - 3 cm.