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Old 05-24-2015, 05:27 PM   #1
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Slow drain shower/Kitchen Sink

Have 2013 45LP Allegro Bus slow draining on shower and kitchen sink. Called Tiffin Tech Support other than the 20 min. hold was told the Kitchen Sink and the Shower have a HEPA filter in line on those drains (no P traps) and chances are that is the issue.

Has anyone changed out the filters/traps on the drains and if so any short cuts to getting to the one for the shower with out tearing out the master toilet. Kitchen sink one is visible when you remove cabinet drawer under kitchen sink.

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Old 05-24-2015, 08:17 PM   #2
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The do not have Hepa filters (those are for air only, btw) but you do have waterless traps. The shower drain probably just needs to be cleaned (take the little cover off and you'd be surprised by the hair and crud you find.

The kitchen sink is caused by a pinched/collapsed drain hose. This takes a bit more work to get at and correct. You can join tiffinrvnetwork.com and ask other owners how they have corrected the problem or you can take it to your dealer to get it fixed.
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Old 05-25-2015, 04:24 PM   #3
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What they said was most likely Hepvo drains...you will find them under the shower, under your kitchen sink floor and if you have washer/ dryer, in that area too. If the kitchen drains slowly, it's either as livlabs said, the drain hose is pinched or the Hepvo is clogged with grease. The shower Hepvo drain can get clogged with hair, you can try forcing water into the drain, I would not use drano unless you do some research on it....
Here is what you have..
Hepvo Waterless Valve
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Old 05-26-2015, 08:15 AM   #4
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Quote:
Originally Posted by garykk View Post
What they said was most likely Hepvo drains...you will find them under the shower, under your kitchen sink floor and if you have washer/ dryer, in that area too. If the kitchen drains slowly, it's either as livlabs said, the drain hose is pinched or the Hepvo is clogged with grease. The shower Hepvo drain can get clogged with hair, you can try forcing water into the drain, I would not use drano unless you do some research on it....
Here is what you have..
Hepvo Waterless Valve

Thanks all, This is should clear the issue up... Too late on the Draino, so I think I will just replace the Hepvo Valves and redo the plumbing while I check for any kinks also.

Chris
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Old 05-26-2015, 12:18 PM   #5
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The valves might be ok , just need cleaning out,,,you might also check the vacuum breaks, they have been known to fail as well. Usually black in color and sitting under sinks etc , they will be vertical and should just screw off.
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Old 05-26-2015, 03:16 PM   #6
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Convential sink drains require venting to operate properly, the HEPVO traps do not need to be vented.
i doubt if you have enough space to add vent lines unless you add the air admittance type of valves. You would be better off replacing the existing HEPVO traps with new ones if you think they are too full of crud.
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Old 05-27-2015, 06:38 AM   #7
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While we were in Florida recently, the shower drain started backing up. I removed the drain cover and carefully removed lots of gunk, but that did not solve the problem. So, we decided to use a mixture of baking soda and vinegar to help clean the waterless trap. After a few minutes of hissing and gurgling followed by a couple of gallons of hot water running down the drain, the problem was solved.

Our coach has no way of accessing the waterless trap under the shower, unless I cut a hole through the cabinetry under the mid ship TV, so I am happy that the vinegar/baking soda mixture worked. Can't understand why TMH did not include an access port under the shower for the 2012 TGA's.
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Old 05-27-2015, 07:50 AM   #8
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The Hepvo Valve under the Kitchen Sink is somewhat accessible. The Shower and I presume the Washing Machine Hepvo is behind the master toilet...to get at that valve, total tear out of toilet to replace or clean out that Hepvo.

No need that these valves were installed at the factory with out a little engineering for servicing. If it wasent such a cluster (bomb) going to the Tiffin factory for service I would have them do it and debate the labor charge.

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Old 05-27-2015, 10:43 AM   #9
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I was reading the FAQ on the Hepvo site, according to them, you can use acidic or alkaline products to clean them so I would imagine you could use drano or other drain cleaning products..
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Old 05-28-2015, 08:26 AM   #10
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We will find out soon if the Draino had any effect. I think for piece of mind I will replace the valves and add that task to my resume of 25 plus years of Motorhome maintenance.

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Old 05-28-2015, 12:53 PM   #11
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If its just clogs rather than a plumbing issue, get one of the $4 plastic hair removers at a hardware store. It's about 18" long, thin, and has little thornlike thingies that grab hair and other spooge in the drain. Can be used without disassembling the hardware. If it doesn't work you're only out 4$.
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Old 09-16-2015, 03:15 PM   #12
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Didn't know my 2010 Itasca 42AD had a HepvO waterless trap until today. After an uneventful 1,000 mile trip down I-75 including two campground stops, we settle into a campground in FL and the stink began. Isolated it to the bathroom sink. Looked under the sink for anything amiss and see this thing instead of a P-trap. It's a HepvO waterless trap and the label says to not use mechanical drain cleaning devices. Found their website and see it's just a flexible material forming a one way valve. Closed the drain, ran hot water in the sink, put camp chemicals in it and ran it down the drain. Washed the sink out a couple times with dish detergent and a sink full of hot water and ran those down the drain too. Not sure what caused the valve to let tank gases back into the coach. But for now it is fixed. Noticed the HepvO costs about $30 plus shipping. If it happens again, I'll replace it.
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Old 09-21-2015, 04:02 PM   #13
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Quote:
Originally Posted by ralphie View Post
If its just clogs rather than a plumbing issue, get one of the $4 plastic hair removers at a hardware store. It's about 18" long, thin, and has little thornlike thingies that grab hair and other spooge in the drain. Can be used without disassembling the hardware. If it doesn't work you're only out 4$.
Do not even think of using one of those on the Hepvo Unit, you will tear out the seal and ruin the trap altogether. Think of it as a similar to a duck bill and what the spikes would do being pulled through the duck bill backwards.
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Old 09-24-2015, 06:44 PM   #14
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Update on my post #12 above. The HepvO waterless trap is a FAIL after only 5.75 years of service. Will have to be replaced. At $40 including shipping, I'm considering replacing it with a P-trap because there is enough room under the sink and I've never had a P-trap go bad on me. Plus it can be snaked without damage. I never snaked the HepvO, BTW.

The HepvO is working as long as the flush valve in the basement is closed. But if it is left open; Oh Boy! There is another sink, a shower, and a washing machine on the same gray tank. None of these smell. So it has to be the HepvO under the bathroom sink.
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