Item Type: Piston Ring_x000D_Model: 80 Piston Ring_x000D_Drive Mode: Pneumatic_x000D_Piston Ring Outer Diameter: Approx. 85mm / 3.3in_x000D_Piston Ring Inner Diameter: Approx. 75mm / 3in_x000D_Cylinder Diameter: Approx. 80mm / 3.1in_x000D_Applicable Models: Cylinder diameter 80mm, cylinder 80 mm, etc, 0.48/0.67 piston, 80 Motor, 4/5.5KW Air compressor air pump accessories_x000D_Description: [80 Piston Ring] The number "80" means that the cylinder diameter is 80mm 1Made of high quality material, durable, the air tightness of the piston and the cylinder wall is good 2The piston ring is suitable for 80mm cylinder diameter, standard workmanship, simple to replace 3The piston ring outer/inner diameter is 85/75mm, which is convenient to replace the damaged one 4When the axial clearance of the gas ring is greater than 0.13mm, you should replace the piston ring 5Suitable for cylinder diameter 80mm, cylinder 80 mm, etc., 0.48/0.67 piston, 80 motor, 4/5.5KW air compressor air pump3 x Piston Ring