This o-ring connects the float shut-off ball and the float pole on the wet/dry vacuum. It prevents water from entering the float ball and causing potential vacuum failure. This o-ring should be inspected before each use of your 'Quench' vacuum. If it fails and water enters the float ball, the seal plate has the potential to not fully seal when the tank is full. This allows water to enter the vacuum motor and that will cause it to fail voiding the warranty on the machine.

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