Ring Set for Both Pistons
Rol-Air Pump Parts

Price: $68.81
Found under the following brands:
Grip Rite, Master Force, Rol-Air, Norgren, Snap-On
This part is available in the following kits
Order rings if your unit is using oil and your valves are good. Hone the cylinder walls prior to installing. Order cylinder gasket if only removing cylinder and installing rings.