321PM4 for all new pumps, has the newer style ball stop pins
Kit includes the following:
6 x Piston Cups
20 x Piston shims
2 x Expander rings
4 x Chrome balls
10 x Manifold O-rings
2 x Lower ball stop pin
10 x 7/16" Ball stop ping o-rings
4 x Valve ball seats
2 x Upper ball stop pin
1 x Hydraulic replacement filter
4 x Air compressor filters
1 x Air compressor belt
Kit includes the following:
6 x Piston Cups
20 x Piston shims
2 x Expander rings
4 x Chrome balls
10 x Manifold O-rings
2 x Lower ball stop pin
10 x 7/16" Ball stop ping o-rings
4 x Valve ball seats
2 x Upper ball stop pin
1 x Hydraulic replacement filter
4 x Air compressor filters
1 x Air compressor belt