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Waste Water Not Draining Out of My RV's Shower

by karen

How to Unclog an RV Drain

How to Unclog an RV Drain

Why won't water drain out of shower? First time out after winterized.

ANSWER: Hi Karen, the first thing I would suggest you do is to make sure that the grey water tank on your RV is not full. When grey water tanks get overfull, the grey water will start overflowing into the shower and the other sinks in your RV will start draining slowly or not at all.

I also suggest that you not trust the readings on the tank level gauges in your RV as they are notorious for being totally inaccurate. So your best bet is to dump the grey water tank and see if that resolves the drain problem in your shower.

If the grey water tank was actually empty and/or the water still does not drain out of the shower after dumping the grey water tank, then that means you have a clog in the pipes leading from your shower to the grey water tank. Yes, the drain pipes in an RV can get clogged just like the ones in your stick home.

The first thing I would suggest you do is try to use a plunger on the drain to see if you can break the clog loose. If that does not work you may need to get some drain cleaner that is safe to use on PVC pipes. Depending on the severity of the clog, you may have to repeat the drain cleaning process.

You can also try using a homemade Baking Soda and White Vinegar drain cleaner to unclog the drain. Simply dump as much baking soda as you can into the drain and then pour some White Vinegar into the drain until the baking soda starts to bubble. When the baking soda stops bubbling pour some more vinegar into the drain. Repeat this process 2 or 3 times or until the baking soda no longer bubbles. Now all you do is pour some boiling water down the drain and that should free things up.

Hope this helps.

Do you have any suggestions or comments on this topic? You can add them to this page by clicking on the "Click Here To Post Comments" link located near the bottom of this page.

Happy RVing

RVing Al

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Air admittance valve/slow shower drain
by: Johnny

I have a similar problem. With the grey tank empty, the first shower drains normally. But as I’m finishing my 2nd shower, I’m standing in a pool of non-draining water.

I go under the bath sink and unscrew the air admittance valve and I hear a swoosh of air and all the tub water drains.

Is my valve bad? What does it do? Why even have a valve there?


Air Admittance Valve

Note from RVing Al: In short, yes you should replace the Air Admittance Valve, it sounds like it is not opening properly to let the water drain out.

Shower wont drain
by: Rick

Air Admittance Valve

Had the same problem. It was a bad vent under the sink. Easy to replace. Six bucks at Lowes.

Note From RVing Al: The vent Rick is talking about is called an Air Admittance Valve (pictured above) and it could definitely be the cause of your problem.

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