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Boxxer 421 Chemical pump check valves.

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I bought and just installed the repair kit for this assembly.
Couple of things I noticed
1. The black rubber diaphram had completely deformed and taken up all available space in the position it sits.
2. The check valves came with O rings but the two that they replaced had no O rings.

Anybody know if the check valve O rings were a modification of the design or might they have just disintegrated?

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