These rebuild kits are easy to replace. There are 3 sizes available.

Piston cup, new cylinder walls and gaskets. The piston cup is usually the main item that wears out.

MPC-60 RK

Rebuild Kit for for MPC-60 (include no.8 Piston Cup x 1, no.11 Cylinder x 1, no.15 Upper/Down Valve Flapper x 2, no.12 Cylinder O-ring x 1, no.17 Valve O-ring x 1 )

PC-120 RK

Rebuild Kit for for MPC-120 (include no.8 Piston Cup x 2, no.11 Cylinder x 2, no.15 Upper/Down Valve Flapper x 4, no.12 Cylinder O-ring x 2, no.17 Valve O-ring x 2)

MPC-200 RK

Rebuild Kit for for MPC-200 (include no.8 Piston Cup x 2, no11. Cylinder x 2, no.15 Upper/Down Valve Flapper x 4, no.12 Cylinder O-ring x 2, no.17 Valve O-ring x 2)