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Broken kitchen sink drain


Gary Petersen

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My problem is with the kitchen sink drain in our 2002' Signature Centurion which has the drivers side kitchen slide-out. We started getting  sink water running across the floor whenever we drained the kitchen sink. I thought at first, this sounds like a reasonably easy plumbing issue to fix. Wow, was I wrong.

I located the white colored, and stiffly corrugated 1 1/2" PVC Flexible drain pipe. I found that due to the lack of cabinet space, I could see that the pipe had been abruptly kinked to 90 degrees against the inside wall of the cabinet, specifically when the sink is in the "slide-in" position. Question: Could this possibly be Monaco's original design? Or did I find some after market repair? 

This sharp 90 degree kinking occurs just after the transition from ABS to the flexible drain. It must have happened so many times that it fractured the flexible corrugated  pipe. (photo below)

This design requires that the drain pipe be flexible so as to maintain the the integrity of the drain while constantly flexing as it maintains the 180 degree turn as the "slide-out" travel makes the pipe move several inches.

I cut out the "kink" and tried to reconnect the piping using a Fernco fitting with double hose clamps but the drain pipe pulls out of the Fernco when the Slide is sent out.

Is this the original plumbing system and has anyone else had to deal with this? I am north of Seattle; can anyone suggest a shop that may be  familiar with this Monaco system? 

Thanks, Gary

 

 

IMG_6322.thumb.jpg.e9bc09fe941995a8d6dcb26891f4a87f.jpgIMG_6321.thumb.jpg.7abf3477a975c86634dc7f6d7b34fe1f.jpgIMG_6390.thumb.jpg.6e2b95793a3505b9daf4608ff2b24c17.jpg 

 

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That is the worst design. I have the same thing on my 2003 signature kitchen slide, only it's on the passenger slide. Mine didn't kink like yours, but the flexible pipe pulled away from the solid pipe, and the clamps that held the kitchen drain pipe to the wall pulled away, causing lots of extra movement.  It's not too difficult to fix yourself.

I have a slider / pulley type system that rolls with the flexible pipe when slide is pulled in and out. Is yours the same? 

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Joe,

It is comforting to know that one is not alone with this problematic  system.

I do not see any pulley type system which would roll, or assist the movement of the  flexible pipe in my system. 

Do you recall if your hose system had a "Glued" 45 degree PVC fitting as shown in my photo?

Any advice as to what you did to solve your problem?   My Furnco connector did not work.

Were you able to use the existing pipe or did you have to replace the existing pipe with something new? 

Thanks,

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Has no one pointed out the artwork on the graph paper! Like I know this doesn't aid to your fix and I apologize but he took the time to draw it out on graph paper!!! High five bud!

 

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Harry posted a great how to thread on replacing the flexible drain hose. Several of us have had to replace it.
There should be a trolley that carries the hose when the slide goes in/out.

I used industrial reinforced blue PVC tubing I found at American Hose and Rubber Co.
The hose ID is 1 1/2". The steel barb fitting is a Dixon ST20.
However, I was not able to use the long steel hose barb on the top because it interferes with the door that covers that section of the cabinet. I ended up using the short nylon hose barb from Home Depot.  This short hose barb really helped stop the kinking with the slide in.  
The hose is part number BW150X100 108HO PVC S&D. Four feet.
Post # 79 (lots of pictures in this thread)
https://www.irv2.com/forums/f115/kit...-383127-6.html

Edited by vito.a
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To me it looks like someone's quick fix. In my case the flexible piece at the bottom was longer towards the sink and no 45 degree elbow is involved. Because of our floor plan, my access was through bathroom cabinet below bathroom sink but same principle. 

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Here is a parts breakdown of my kitchen slide plumbing, which provide a good visual and shows the trolley that aids it the extend/retract function.  The trolley is nothing more then a pocket door hardware kit, with comes with the track, two of the roller systems, and attaching hardware.   My guess is someone just decided to free style it. 

There have numerous posts on IRV2 on this and some seem to have found a better hose. 

1 Kitchen slideout plumbing.pdf

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It's a common issue. Mine broke with the same kink as you had. That aluminum rail in your pic should be the trolley. You can redesign it so that it moves better without much hassle. I did a fair bit of rearranging when I did mine and when done the slide operated much better so it was binding in a number of areas. By the looks of it you have easy access...

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20 hours ago, Gary Petersen said:

My problem is with the kitchen sink drain in our 2002' Signature Centurion which has the drivers side kitchen slide-out. We started getting  sink water running across the floor whenever we drained the kitchen sink. I thought at first, this sounds like a reasonably easy plumbing issue to fix. Wow, was I wrong.

I located the white colored, and stiffly corrugated 1 1/2" PVC Flexible drain pipe. I found that due to the lack of cabinet space, I could see that the pipe had been abruptly kinked to 90 degrees against the inside wall of the cabinet, specifically when the sink is in the "slide-in" position. Question: Could this possibly be Monaco's original design? Or did I find some after market repair? 

This sharp 90 degree kinking occurs just after the transition from ABS to the flexible drain. It must have happened so many times that it fractured the flexible corrugated  pipe. (photo below)

This design requires that the drain pipe be flexible so as to maintain the the integrity of the drain while constantly flexing as it maintains the 180 degree turn as the "slide-out" travel makes the pipe move several inches.

I cut out the "kink" and tried to reconnect the piping using a Fernco fitting with double hose clamps but the drain pipe pulls out of the Fernco when the Slide is sent out.

Is this the original plumbing system and has anyone else had to deal with this? I am north of Seattle; can anyone suggest a shop that may be  familiar with this Monaco system? 

Thanks, Gary

 

 

As mentioned, this is a moderately common issue, and there are write-ups in the Files section on Monacoers and various threads on other sites.

It’s not terribly hard to replace the “flex” hose. The transitions from the white PVC to the black ABS should be threaded. Cut the “flex” hose close to the fitting and unscrew the PVC. You can get replacement PVC fittings and the hose (called “spa hose”) at Home Depot or equivalent.

You can also make things a bit easier by using more flexible hose. I used the 1” plastic hose and a simple step-down PVC bushing with a barbed adapter. Much easier to replace if anything bad happens in the future, and plenty of capacity for whatever goes down the kitchen sink.

Your pictures and diagram (+) appear to show the “trolley” that’s supposed to slide in and out and stabilize the hose when moving. You’ll want to make sure that moves freely and address any issues with movement. This would also be a good time to make sure that movement hasn’t caused any excess stress on the entire ABS pipe back towards the stove and sink. Ours developed a crack behind a cabinet that had to be replaced.

https://ourrvrepairs.blogspot.com/2015/01/kitchen-sink-drain-fix-round-2.html

Or, on Monacoers web site, navigate to Home > Downloads > Water Systems and you’ll find a couple of files on Kitchen Sink Drain issues.

George C, 2005 Exec
 

Edited by georgecederholm
Added info on Monacoers Downloads section
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37 minutes ago, georgecederholm said:

 

You can also make things a bit easier by using more flexible hose. I used the 1” plastic hose and a simple step-down PVC bushing with a barbed adapter. Much easier to replace if anything bad happens in the future, and plenty of capacity for whatever goes down the kitchen sink.

George C, 2005 Exec

I also replaced ours with 1" hose about 3 years ago and it gave way again.  In the interest of time I replaced it again with 1" hose, but my wife complains about the reduced drainage so one of my projects this winter will be to go back up to either 1 1/2" or possibly 1 1/4".  I agree it isn't a terribly hard project.
 

 

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We have experienced the same problem, twice, so I went to a auto parts store and looked up a flexible radiator hose the length and diameter I needed.  I put slip on connectors at each end of the plumbing plastic and used double hose clamps on each end. That has worked for 4 years now.  You need a parts person experienced in looking up something by size and not by application.  Those types are getting harder to come by with everything by application on a computer.  Hope this may help and have a great day. Happy trails Bert

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  • 1 month later...
On 9/16/2021 at 1:52 PM, Jobert said:

We have experienced the same problem, twice, so I went to a auto parts store and looked up a flexible radiator hose the length and diameter I needed.  I put slip on connectors at each end of the plumbing plastic and used double hose clamps on each end. That has worked for 4 years now.  You need a parts person experienced in looking up something by size and not by application.  Those types are getting harder to come by with everything by application on a computer.  Hope this may help and have a great day. Happy trails Bert

I have found that the NAPA Associates seem to be better at this (Finding matches for parts by size)  than others. Especially if you can find a NAPA Auto and Truck parts store!  I replaced all my Radiator hoses after I had a hose part on I-90 on Labor day (and roadside service was pretty much unavailable).

John

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  • 4 weeks later...

I just got around to fixing the leak in my slide-out kitchen sink drain.  I searched for about three days to find a pvc 1 1/2" swivel.  I cut the flexible pvc just below the duct tape and replaced the 90 degree elbox with a new elbow and the swivel fitting.  The part I finally found is an ATD8-015 Swivel 1.5 MPT x 1.5 FPT from flexpvc.com, cost with shipping was $50.10, worth it to me.  The picture labeled bad drain shows plumbing position with slide retracted, picture labeled fixed shows it with slide retracted after repair.  The swivel allows the hose to rotate and not creat a stress.

Happy Holidays

Mike Fluharty

2003 Safari Zanzibar

ISL 370

bad drain.JPG

fixed.JPG

  • Thanks 2
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Mike,

Great fix and excellent job well done. That would be well worth it to me also to never have to deal with it EVER again.

Can you explain  how the fitting swivels and does not leak? Do they use special seals that allow it to move but still keep the water in the pipe?

Can you point me to the web page where you purchased the special slip fitting? I did a quick search and didn't come up with any hits.

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To find the part go to http://flexpvc.com, once there the upper right hand corner has search box, put ATD8-015 and part will com up.  I couldn’t find a 90 degree elbow with slip on one end an threaded on other so I put pvc thread x slip on each end so I could thread onto the slip joint an the glue the elbow on one end and the other end to existing pipe that I had to shorten.  Use Weld On 795 PVC glue (use regular primer on the pvc flex hose with the 795 glue. I didn’t find the glue at big boxes, went to Ferguson plumbing. As far as how the swivel works, I don’t, but it is rated for pressure and there isn’t any on my drain. Hope this helps.

Oh yea, I just trimmed the bad part of hose and left the bottom part alone. I dry fit the elbow to hose, ran slide in and out, didn’t pull apart and didn’t looked strained, so I glued it. 

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Mike, that's a good idea.  I'm sure everyone will want a long term report as that spa hose gets very stiff in cold weather and has stymied more than a few of us.  My Signature drain line is routed completely different so I don't think I can use the swivel but I'll certainly look at that the next time I'm in there.

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Oh yea, I just trimmed the bad part of hose and left the bottom part alone. I dry fit the elbow to hose, ran slide in and out, didn’t pull apart and didn’t looked strained, so I glued it. 
 

Update, make sure to use Teflon tape or paste to go from grey swivel to white pvc piece that will be glued. I tighten the threads as tight as possible to avoid possibility of it unscrewing from swiveling back and forth.
 

As far as spa hose lasting, mine is 20 years old and with the kink removed I am pretty sure it will last till I’m done with it. 

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Drain pipes under the kitchen slide keep coming apart | The RV Forum Community.pdfDrain pipes under the kitchen slide keep coming apart | The RV Forum Community.pdfDrain pipes under the kitchen slide keep coming apart | The RV Forum Community.pdfDrain pipes under the kDrain pipes under the kitchen slide keep coming apart | The RV Forum Community.pdfDrain pipes under the kitchen slide keep coming apart | The RV Forum Community.pdfDrain pipes under the kitchen slide keep coming apart | The RV Forum Community.pdfDrain pipes under the kitchen slide keep coming apart | The RV Forum Community.pdfitchen slide keep coming apart | The RV Forum Community.pdfOk, it has been since Sept when I posted my plea for help with my sink drain issue. Well, due to "supply chain" issues, and a busy schedule, I was just finally able to install a new drain hose with an 1 1/2" Aluminum drain swivel. I am "attempting" to attach a copy of the article from the RV Forum which I stumbled across (where are the techie grand kids when you need them?) and what I think is an excellent solution to the hose kinking problem.

The source mentioned in the article for the Aluminum swivel, I found was no longer available so, our local industrial hose store was able to order a comparable 1 1/2" Wedgon brand Aluminum Swivel. I wish I had found Mike's flexpvc.com source as I could have saved a bunch of cash. As a prevent maint. I replaced all the ABS from the "P" trap to the swivel's male aluminum threads. So, coming onto the Swivel, I put a 1 1/2" female ABS threaded coupler.  Coming out of the 90 degree swivel is a Male threaded PVC coupler which transitioned to accept the new PVC spa hose (from Home Depot). I tried to follow the design and process of the article and although it required some minor adaptations, and some cramped working conditions, so far. I feel please with the results and would recommend using a swivel to others who have this issue.

Drain pipes under the kitchen slide keep coming apart | The RV Forum Community.pdfDrain pipes under the kitchen slide keep coming apart | The RV Forum Community.pdfDrain pipes under the kitchen slide keep coming apart | The RV Forum Community.pdf

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