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Old 11-05-2010
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If fact, one can over-tighten the bolts holding a joker-valve in place and, if the flange for the collar is not perfectly flat, that can spread the lips enough to allow leakage, particularly it the water column is not great enough that the water pressure forces them closed. It really doesn't reguire much torque on the bolts to create a water-tight seal around the collar base.

FWIW...
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