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. * Resistant to corrosion, oxidation, high temperatures, and wear. * 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 sizes, it is convenient to install and disassemble. * The component has no casting defects such as cracks, pores, or looseness, ensuring a tight connection. * The kit contains 1 piston, 3 replacement piston rings, 1 pin, and 2 circlips, which can replace old or damaged parts on the air pump as needed. 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: 1cm = 10mm = 0.39inch. 2. The actual color of the item may vary slightly from the pictures shown due to factors such as monitor brightness and lighting conditions. 3. Please allow slight variation due to manual measurement.