Are you sure that wasn't Gerald Ross?, who clearly stated:
> There is some venting through the overflow on bathroom sinks Check >
> that the hole is not stopped up and that water will actually go down
> the overflow.
And again, Doug was correct, as it was indeed a "venting" situation, but
just not with the system vent.
The sink has a standard plunger that when you raise the rod on the top
of the sink allows the plunger to go down into the drain in the bottom
of the sink to close it.
With out the plunger, the sink always takes all of the water I can put
When the bubble forms, you can get it our by moving the plunger. The
bubble seems to form between the plunger and the lip which it sits down
This in only one half of the double sink in the bathroom the other side
I have taken the trap off and checked the pipe. There appears to be
nothing in the pipe. After reassembling, the drain flowed as it should
without the plunger.
When you wiggle the plunger you can see the air bubbles come out.
IMNSHO, it's the plunger. If it doesn't raise much, not enough water
flows down to generate a siphon of sorts. Adjust the plunger to go up a
little more and the sink will drain properly. I have the same problem
with our single sink in this 80-odd year old house (probably a mid-50's
redo of the bathroom). The darn plunger always slides off the lifting
mechanism just a little and then it drains oh so slowly.
Until your last sentence, I was thinking that the vent might be
obstructed...not enough air for the water to leave the basin easily. Might
still be that, hard to know without seeing how the drain is set up.
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