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Old 03-03-2005, 05:52 AM   #1
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overflow to sump ?

When plumbing an overflow, should the outlet of the drain be above water, or below?

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Old 03-03-2005, 08:29 AM   #2
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The outlet off the overflow box should be submerged under water in the sump. If it is not you will get a loud trickling/waterfall noise. The outflow pipe in the overflow box will determine the water level in the overflow box. It should be at a height that allows both ends of the U tube to always stay submerged (to keep siphon).
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flow, overflow, sump

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