Crathco 3311/3312 PM Tune Up Kit. Includes all parts needed to prevent machine leaks. 
Includes part#:
Qty. 3 Plunger o rings #W0340022
Qty. 1 Valve Body o-ring #W0340055
Qty. 1 Rear Shaft Seal #W0340201
 
Contact us @ 281-220-6909 for tech support and questions.