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not exactly handle, but be big enough to not be submerged.
think of it just like a drain from a tank display to a sump. Either the drain water doesn't completely submerge the bulkhead opening, or else a standpipe of some sort is needed to keep it quiet.
my bucket when the cover isn't on, it does a little gurgling now and then, but with the bucket covered, I can't hear it at all.
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