51mm / 2in. When the axial clearance of the gas ring is greater than 0.13mm, you should replace the piston ring. Item Type: Piston Ring. Model: 51 Piston Ring. 54mm / 2.1in. 48mm / 1.9in. If you do not receive our reply within 48 hours, pls.
This product would be ideal for individuals who need to replace piston rings in their air compressor's 51mm size.
