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Old 05-16-2020, 07:26 AM   #1
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2014 Interstate Ext. Coach
Raleigh , North Carolina
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Help - Kitchen sink not draining

This is one I never expected. Traveling and awoke this AM to a stopped up sink. I have started with ta plunger but no luck. The shower is not stopped up, the tank is not full. What should my next step be? Any thoughts?
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Old 05-16-2020, 08:23 AM   #2
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Idaho Falls , Idaho
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This is the type of trap that is in the coaches. It has a one way baffle in it. You are not suppose to use chemicals on it or stick anything thru it. Called a Hepvo.

https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

I have never had it plug.
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Old 05-16-2020, 09:20 AM   #3
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Quote:
Originally Posted by Passin Thru View Post
This is the type of trap that is in the coaches. It has a one way baffle in it. You are not suppose to use chemicals on it or stick anything thru it. Called a Hepvo.

https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

I have never had it plug.
Thanks! That is what I needed to know.
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Old 05-16-2020, 09:44 AM   #4
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2018 25' International
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Chemical cleaners including acid based clog discovers up to 10% strength are okay. See their website here.

You wouldn't want to leave it in your tank too long so best to head to a dump station straight away.

I wouldn't use a drain cleaner though. I'd use a wet vac to empty the sink and drain and then remove the trap and clean it by hand. I don't mind dealing with yuck though so...

If you're worried about harsh chemicals on the rest of the system, if the tank is nearly full when you start and you can dump it right away it won't be a problem, but you could go with the slow but steady method using an enzyme based cleaner. It will take a while but it will do the job.
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Old 05-16-2020, 11:18 AM   #5
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Hepvo traps sometimes stick when they have been unused for some time, but I have never had one that would not open when pressure is applied. I have even used the heel of my hand to open the shower drain when I first bought my 2014 after it sat on the dealer's lot for a while.

If you are pressing with liquid, the liquid is not compressible and the trap surely should open. If you are using a plunger, make sure the plunger is full of liquid; air in the plunger will compress and reduce the force it can exert.
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Old 05-16-2020, 11:49 AM   #6
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Plunger definitely not working, even full of water. Looks like I’ll be pulling it apart to clean. It appears to be threaded and can be done by hand.
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Old 05-17-2020, 10:19 AM   #7
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Easy to clean

We cleaned ours out last year. Took out the entire valve and accompanying plastic pipe!
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Old 05-17-2020, 04:55 PM   #8
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We had the same problem a couple of years ago. We had to remove the HEPVO to clean it. It didn’t seal particularly well when reinstalled. We should have replaced it instead.

A representative we spoke to at an RV show suggested dumping a container of very hot water down the sink on a regular basis. We tried this and it seemed to help.

I think our efforts to conserve water were partly to blame. Also, our HEPVO installation was close to horizontal which certainly didn’t help.

We recently yanked the Dometic sink and installed a regular sink and faucet. We replumbed so that the HEPVO is nearly vertical. We’re hopeful the performance will be better - time will tell!
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Old 05-17-2020, 06:43 PM   #9
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Follow the hot water with a bit of the enzyme rv tank cleaner. It will keep the valve clean.
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Old 05-18-2020, 06:56 AM   #10
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Thanks for the help. Completed the cleaning and it was easy. I did find a small blockage in the union below but it was easily cleared. All is well and I now know a bit more about my coach.
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Old 05-18-2020, 07:58 AM   #11
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I have never looked at the traps in my 2012 25 Serenity. Are they these HEPVO things or just a normal trap? I know the bathroom sink is just a normal trap because I had to replace it when I redid the plumbing in there.

Larry
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