Check the listing for details. Air Compressor Part 66.5mm OD 48mm ID 1mm Thickness REPLACE Black. Condition: New. Listed at 16.48 USD. Description:[Size] - 66.5mm (2.62 Inch) OD, 48mm (1.89 Inch) ID, 1mm (0.04 inch) Thickness | Quantity: 1 Pcs[Application] - It is a universal air compressor replacement part, widely used for replacing the piston ring to the air compressor[Advantage] - Made of PTFE Plastic material has a self-lubricating function, high seal, wear-resistance, and durable in use, all in use do not need to lubricate. It added lubrication adaptive layer will be fused into the main body layer so that the service life is greatly increased[Instruction] - 1. Disassemble the piston cylinder to remove the old air compressor piston ring in decompression and pressure. 2. Clean the piston cylinder and piston rod then replace the old piston ring with the new one. 3. Put the components back in place and tighten them in order[Note] - 1.