Do Sink Air Admittance Valves work?
 

I have a sink in a bedroom addition that does not have a ceiling vent. I am considering either installing a vent to the outside (expensive/hard/possibly leaky) or just an air admittance valve under the sink. Goal is to avoid the siphon from the trap and scent that may come from that. What to do?

What is the problem that you are trying to solve?

It may not be up to code where you are but the air admittance valve will work.

Problem is what could be a bit of a scent and also slow draining.

Haven't bought the place yet but its getting close. Was just thinking of how to tackle this sink once its sealed.

Do the air admittance valves allow any scent or do they really snap back quickly as advertised?

I installed two in my kitchen remodel a couple years back. One for the sink and one for the washer. They work perfectly with no odor. YMMV

yep, works fine. No odor only a light hiss when the valve opens, mine is audible as it's in the laundry room not in a cabinet.

I won't mind the hiss. If anything I will enjoy the mechanics of it LOL.

I see there are some that install directly inline under the sink. Assuming things go well and I go with this house I think the solution should be easy/cheap.

Now how about those bang arrestors on the water lines going to the washer? Currently washer is not hooked up but I noticed those things for sale and figured I should run a pair? Or is it just a length of pipe with air in it?