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