Features: * High quality replacement piston, suitable for piston air compressors and air pump pistons. * The whole machine has a simple and compact structure, light weight, and flexible movement. * Anti-corrosion, anti-oxidation, high temperature resistance, wear resistance. * The function of the piston ring is to maintain the air tightness between the piston and the cylinder wall. * With standard inner and outer diameter size, it is convenient to install and disassemble. * The product has no casting defects such as cracks, pores, or looseness, ensuring tight connection. * The kit contains 1 piston + 3 replacement piston rings + 1 pin + 2 circlips, which can replace the old or damaged ones on the air pump at any time. Specifications: * Product name: Air Compressor Piston + Piston Ring * Material: Metal * Color: Silver, Black * Size: (Optional) 42mm, 47mm, 48mm, 51mm, 65mm, 70mm, 80mm, 90mm * Suitable for: Piston type air compressor, air pump piston * Quantity: 7 pcs/set Package Content: 1 x Air Compressor Piston 3 x Air Compressor Piston Rings 1 x Pin 2 x Circlip Note: 1. Conversion: 1 cm = 10 mm = 0.39 inch. 2. The real color of the item may be slightly different from the pictures shown on the website due to factors such as monitor brightness and lighting conditions. 3. Please allow slight manual measurement deviation.