2 bowl sinks use a TEE fitting in the drain (either horizontal
or vertical TEE). The TEE should have a baffle plate inside to
help prevent flow backing into the other bowl. Some work better
To see if the drain is partially blocked, fill one bowl with water,
then suddenly pull the stopper. Water should drain rapidly and should
not back up into the other side.
Jim, probly got this one, you may not have a baffle at all. Mine doesn't, I
replaced my drains, mostly to gain more space by replacing two P traps directly
under each sink by one closer to the back wall. I think my minor 'back flow'
is mostly caused by the lack of seperate P traps, without the resistance of
the trapped water under the second sink, the resistance in the one trap
causes that momentary up flow. There's a bit of problem with my vent stack too
cause I do sometimes get a real nice gurgle especially if I drain both full
sinks at once. I do that with really hot water and bleach from time to time to
clean the sink and maybe force anything on thru the drain pipes, So check your
vent. I might not have quite enough slope to my drains from sink to sink to
verticle above the P either, the dishwasher usually doesn't cause any backflow,
but I may have used the right kind of T there and it connects way lower just
above the P. Then again a big ol' hop toad may have wedged hiself in there.
That's usually the cause of the problems in the drain i installed tryin to keep
rain floods out of my slowly sinkin garage. Boy, does that toad look s'prised
when he finally makes his way upstream and out from what he thought was a nice
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