It is a rubber seal with a diameter of approximately 1.5 inches, that sits between the pump and filter to prevent air and paint leakage between the two mating parts. If the ring is lost, worn out, damaged, or has lost elasticity, it will need to be replaced. It's located at the base of the fluid section where the cup attaches. This O-Ring ensures a proper seal, preventing leaks during operation.
$6.3
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