1、Air tightness between the piston and the cylinder wall is good, and there is no leakage. 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, easy to install and disassemble, can be repeated and used for a long time. 4、The function of the piston ring is to maintain the air tightness between the piston and the cylinder wall. 5、The surface has no casting defects such as cracks, pores, looseness, etc., ensuring tight connection. Item Type: Piston Ring Replacement Model: 48 Piston Ring Drive Mode: Pneumatic Piston Ring Outer Diameter: Approx. 50mm / 2in Piston Ring Inner Diameter: Approx. 46mm / 1.8in Applicable Models: Approx. 48mm / 1.9in cylinder diameter for Outstanding/Jaguar 1P/2.5P/3P air compressor air pump accessories 3 x Piston Ring Replacement