Replacement vanity sink with no overflow

[Ken Tannenbaum1]

The venting is properly done in a house were buying. However, I'm replacing the old vanity sink with one that has no overflow. Is that the same as having a "built-in" vent such that in replacing it I need to vent the new sink differently? There's plenty of room for an AAV to be installed as an alternative, but do I need it?
Thanks very much.

 

[Smooky]

A sink overflow is different than a vent. The plumbing vent is in the wall usually. You just need the proper pop-up for a vessel sink without an over flow.

http://www.lowes.com/pd_635666-2846..._clickID=ed7209f1-694c-437e-be47-7c93ecc39b56

 

[Sponsor]

 

[hj]

You do NOT have to change the plumbing, if the original sink was done correctly, but you should understand that sinks without overflows do NOT always drain as rapidly as the old one did.

 

[Ken Tannenbaum1]

Hey, THANKS for the info

 

[Terry]

For instance, some grid drains will drain very slowly with a non-overflow lav.
They make some grid drains with domes to break up the stickyness of the water,

http://mountainplumbing.com/catalog...ern-Lavatory-Grid-Drain-without-Overflow/3114

and some with pop-ups that raise high enough that the water will flow under the pop-up. Many standard drains have a hard time without the overflow.

http://www.us.kohler.com/us/Pop-up-...ow/productDetail/shower-components/425614.htm

 

[hj]

The speed of drainage will depend on whether the air trapped in the drain line riser can "escape" at the same time the water is trying to flow through the openings.