B5000 / B5900 Air Compressor Pump Ring Kit, High Pressure (HP) #09A57C
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Description
Includes all four (4) rings for the smaller, high pressure (HP) piston (hone the cylinders before installation). For the B5000 and B5900 model air compressor pumps.
If you have a sudden loss of performance or if the pump is using too much oil, replacing the piston rings usually repairs the problem.