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Installing Poly Holding Tank Fittings Made of high density polyethylene. Requires use of hole saw for installation of grommets. For 3" fitting use a 3-7/8" hole saw. For 2" fitting use a 2-3/4" hole saw. For 1-1/2" fitting use a 2-1/4" hole saw. After grommet is seated in tank, upper lip must besealed with silicone bathtub caulk.


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