Complete Piston + Rings Set for Air Compressor 42/47/48/51/65/70/80/90mm Sizes
Size: (Optional ) 42mm, 47mm, 48mm, 51mm, 65mm, 70mm, 80mm, 90mm. Suitable for: Piston type air compressor, air pump piston. The function of the piston for Ring is to maintain the air tightness between the piston and the cylinder wall.