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QMP300WR is our standard Slim Boy Water Filter Housing Wrench that is compatible with all of our standard housings and slim boy housings except the big boy line.

Only use our wrench to loosen filter housings, never to tighten. Over tightening the housing can cause damage to the O-rings and make re-opening extremely difficult so only hand tighten.

For stubborn filter housings use two wrenches together to get maximum power, where one wrench might not work properly.