Feature:1. Made of high quality material, durable, the air tightness of the piston and the cylinder wall is good2. The piston ring is suitable for 80mm cylinder diameter, standard workmanship, simple to replace3. The piston ring outer/inner diameter is 85/75mm, which is convenient to replace the damaged one4. When the axial clearance of the gas ring is greater than 0.13mm, you should replace the piston ring5. Suitable for cylinder diameter 80mm, cylinder 80 mm, etc., 0.48/0.67 piston, 80 motor, 4/5.5KW air compressor air pumpSpecification:Item Type: Piston RingModel: 80 Piston RingDrive Mode: PneumaticPiston Ring Outer Diameter: Approx. 85mm / 3.3inPiston Ring Inner Diameter: Approx. 75mm / 3inCylinder Diameter: Approx. 80mm / 3.1inApplicable Models: Cylinder diameter 80mm, cylinder 80 mm, etc, 0.48/0.67 piston, 80 Motor, 4/5.5KW Air compressor air pump accessoriesDescription: [80 Piston Ring] The number "80" means that the cylinder diameter is 80mm .Package List:3 x Piston Ring