dishwasher vent

sanddab · May 17, 2009

My current dishwasher has a vent tube that exits on top of the sink through a little chrome tower. My last dishwasher didn't have one. My wife wants a new sink, what does the vent do and do I need it?

Thanks Jim

NHmaster · May 17, 2009

what that is is a vacuum breaker for the dishwasher drain. It is required by code. You can either put it on the new sink or counter top mount it.

Sponsor · 2022-01-29T12:20:58-0800

Kingsotall · May 17, 2009

plumbingskool said:
Oh please post pictures

Do you have a thing for air gapsÂ¿

Jadnashua · May 17, 2009

An air gap is by far the safest way to connect your DW to the drain. It is required in many places, and a good idea where not required. If prevents any waste water from ever getting back into the DW, contaminating what you may think are clean dishes.

NHmaster · May 18, 2009

nhmaster said:
what that is is a vacuum breaker for the dishwasher drain. It is required by code. You can either put it on the new sink or counter top mount it.

Thanks for the graphic Terry

hj · May 18, 2009

air gap

It depends on where you live. Here, I have not installed an air gap in 35 years, but in Chicago every dishwasher has to have one.

sanddab · May 18, 2009

Thanks all, can it be installed under the sink so we don't have to look at it?

NHmaster · May 18, 2009

Not that one.

SewerRatz · May 18, 2009

They do make one that mounts under the sink, the down fall is if the sink line backs up it will back up out of the air gap.

NHmaster · May 18, 2009

not ipc legal Ron. because...well you just posted why.

Technically they should be mounted above the flood level rim of the fixture served which in this case is the sink drain.

dishwasher vent

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