1、Using high‑quality materials, the air tightness of the piston and the cylinder wall is good 2、When the axial clearance of the gas ring is greater than 0.13mm, it is recommended to replace the piston ring 3、Standard production and fine craftsmanship, easy to install and disassemble 4、The piston ring outer/inner diameter is 68/62mm, which is convenient to replace the damaged one 5、Suitable for cylinders with a cylinder diameter of 65mm, 2.2KW 3.0KW motor, 0.25 0.36 air compressor, air pump, etc. Item Type: Piston Ring Model: 65 Piston Ring Drive Mode: Pneumatic Piston Ring Outer Diameter: Approx. 68mm / 2.7in Piston Ring Inner Diameter: Approx. 62mm / 2.4in Cylinder Diameter: Approx. 65mm / 2.6in Applicable Models: Cylinder diameter 65mm, cylinder 65 mm, etc, 2.2KW 3.0KW motor 0.25 0.36 air compressor air pump accessories Description: [65 Piston Ring] The number "65" means that the cylinder diameter is 65mm 3 x Piston Ring