I primarily use the right sink which has a garbage disposal. Maybe this isn't a good idea? Anyway, I notice that when soapy water goes down the right sink drain, sometimes the bubbles go up the left sink drain and start coming out the strainer into the sink bowl. My assumption is that I can improve the sink plumbing to eliminate that problem.
Here's a few pics of the current plumbing:
My question is this: what is the pipe on the left side that appears to have a plug or cap on it? Is it possible for me to unplug it, then plumb the left sink to that pipe, and then plumb the right sink to the right pipe, thus having two waste pipes?
Best Answer
It could possibly be a clean out valve. These valves are often found under sinks which clog easily and/or often (like the kitchen sink), because they provide an easy way for a plumber to access the clog. It is much easier for a plumber to access a clog in a drainpipe that has a clean out valve, because the plumber can access the clog through the valve, which is usually a straighter line to the clog than having to go through the sink drain's p-trap, where drain cleaning equipment might become stuck or at least more difficult to maneuver.
I would not recommend routing a second drain line through the mysterious valve for three reasons:
I would just leave your kitchen sink plumbing as it currently is, since it appears to be plumbed correctly, and bubbles coming up on the other side of your sink is a common and harmless problem. I often experience that problem myself, and the way I handle it is by simply running water down the drain in the sink where the bubbles are coming up. Usually, that washes the excess suds down the drain, and it is a simple, effective solution.