Valve Plate
Rol-Air Pump Parts
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Price: $78.42
Found under the following brands:
Grip Rite, Master Force, Rol-Air, Norgren, Snap-On
If your valve plates are pitted or the valve holes are not lining up with your valves, then you will need to replace these. 2 required for a set. Poor performance or air leaks out of the intake filter while the unit is running? This is probably the problem.