02-20-2008, 08:43 PM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 3,549
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IF the drain pipe made a ninety degree bend somewhere in the wall then went down, even pouring pasta water in it wouldn't make a banging noise unless there was a gas pocket with debris at that bend. maybe there is a trap in the drain line, that would account for the water getting superheated all at once and starts to bang but seems highly unlikely.
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