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 air tightness between the piston and the cylinder wall. * Standard inner and outer diameter sizes for easy installation and removal. * The product has no casting defects such as cracks, pores, or looseness, ensuring a tight connection. * The kit includes 1 piston, 3 replacement piston rings, 1 pin, and 2 circlips, allowing timely replacement of old or damaged parts on the air pump. 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 images shown due to factors such as monitor brightness and lighting conditions. 3. Please allow slight variation due to manual measurement.