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 > Shower clog or something else?

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BeeDub

Montana

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Posted: 07/13/20 07:00pm Link  |  Quote  |  Print  |  Notify Moderator

I have an interesting problem that I have never seen before. During our last outing, I noticed there was standing water in the shower drain after the first shower was taken in the rig. I found it hard to believe that the grey water tank needed dumping already. So I opened all the valves to the tanks to drain all the water/wastewater. Still had standing water in the drain. I poured a bucket of hot water down, thinking maybe there was a clog and it would rinse it out. Interestingly enough, the water drained fast, but yet there was still standing water in the drain. We took another shower, and there was never any problem with a slow drain (the water drained fine and never backed up), but always standing water inside the drain.

Brought the rig home and drained out everything - grey, black, fresh, low-point drains, etc. Still standing water in drain. Used the vinegar & baking soda solution but it didn't help. Tried flushing it with the garden hose - nothing. Tried using that plastic hair drain tool - nothing. I am stumped as to why I can get all the water flushed out of the shower pipes.

After looking at the piping, it looks like there is no p-trap for the shower drain. Anyone have any suggestions as to what my problem is and how I can fix it?


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Dutch_12078

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Posted: 07/13/20 07:29pm Link  |  Quote  |  Print  |  Notify Moderator

Some RV's use a "Hepvo" or similar inline seal instead a traditional 'P' trap. The rubber "flutter valve" seal opens when there's sufficient flow through it, and it's normal to see some retained water in the drain. As the valve ages, it can get stiffer and retain more water than when new.

Hepvo Waterless Valve


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larry cad

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Posted: 07/14/20 05:15am Link  |  Quote  |  Print  |  Notify Moderator

Hair buildup in the drain.


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Lynnmor

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Posted: 07/14/20 07:02am Link  |  Quote  |  Print  |  Notify Moderator

Dutch_12078 wrote:

Some RV's use a "Hepvo" or similar inline seal instead a traditional 'P' trap. The rubber "flutter valve" seal opens when there's sufficient flow through it, and it's normal to see some retained water in the drain. As the valve ages, it can get stiffer and retain more water than when new.

Hepvo Waterless Valve


Likely the problem. If you have room to replace it with a P trap, that would be good.





Roger10378

Goodrich, MI.

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Posted: 07/14/20 11:14am Link  |  Quote  |  Print  |  Notify Moderator

So is the water standing in the shower pan or only down in the drain. There is supposed to be some water in the drain. The water is what keeps the tank smell from coming into the trailer.


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Fisherman

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Posted: 07/14/20 02:04pm Link  |  Quote  |  Print  |  Notify Moderator

Use a toilet plunger and blast it out.

pigman1

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Posted: 07/14/20 05:23pm Link  |  Quote  |  Print  |  Notify Moderator

Fisherman wrote:

Use a toilet plunger and blast it out.
That'll work, but go easy at first. I usually have the problem on the first shower after a long dry spell. When still in the shower I stomp hard on the drain a few times with the ball of my foot. Works every time for us. After the first time it usually works fine for the rest of the trip.


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dougrainer

Carrolton, Texas

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Posted: 07/14/20 06:02pm Link  |  Quote  |  Print  |  Notify Moderator

Fisherman wrote:

Use a toilet plunger and blast it out.


NEVER DO THIS WITH A HEPVO VALVE!!!!!!!!!!!!!!!!!!!!!!! THE PLUNGER SUCTION ACTION WILL PULL THE HEPVO VALVE "DUCK" LIPS BACKWARD TOWARDS THE DRAIN, RENDERING IT ALMOST USELESS. HOW DO I KNOW THIS??????? I DID THIS A FEW YEARS AGO AND MADE THE PROBLEM WORSE. I THEN PULLED THE HEPVO VALVE AND FOUND THE LIPS PULLED BACKWARD. LUCKILY YOU CAN JUST PUSH THEM THE OTHER WAY ONCE IT IS PULLED. Doug

remdog*1

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Posted: 07/14/20 06:04pm Link  |  Quote  |  Print  |  Notify Moderator

Check the grey tank vent for blockage. If vent clogged it won't drain

dougrainer

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Posted: 07/14/20 06:05pm Link  |  Quote  |  Print  |  Notify Moderator

If the water is NOT in the shower pan but you can see it below the round strainer, that is NORMAL. For either a Hepvo or P trap system. That is your Water barrier to keep gas/odors from coming back up. Doug

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