My kitchen sink stopped draining. Under the sink I found a provent would this be the reason the kitchen sink isn't draining. Already used a snake no clogs found.

That's a check valve so to speak...Houses have vents to the top of house..Most trailers have those check valves..When water drains it allows air to come in so it will drain..If it malfunctions it could be the very reason it doesn't drain...What I would do is stop up the right side of sink then fill with water...Then plunge the other side...If something's further than your snake it will hopefully unstop it and make it go on down..Hope this helps

My friend is actually facing a similar problem. However, I'm not sure if she's tried to snake the sink like you have. Last time I checked, she was considered going to a service provider since she's not sure what could be causing the problem. I also don't see anything wrong with getting a professional opinion if you've done all you can. http://www.goldsealplumbing.com/drain-cleaning-services/

You need to pull the plumbing under the sink to see if the trap is clogged. Snake after the trap.