Kitchen Sink Hepvo Install

[tdf-texas]

I was never too happy with the ABS piping for the kitchen sink in my 2017 21'. The trap drain fitting was located where it was hard to empty without dumping water behind the paneling in the bottom cabinet. It seemed to take up a lot of space that could be used for storage. But more important than all these, the sink never seemed to drain well - if I turned up the faucet too high, the sink would flood.

After looking at the installation, I found that there should be a vent on the piping and there are a total of six 90 deg bends in the piping impeding the water flow. So I decided to fix it. As a Hepvo valve doesn't need a vent and only uses two 90's, that seemed the way to go.

I cut out the old piping (pic 1), then cut out a new hole in the shelf for the Hepvo pipe routing, glued a ABS to SJ transition to the pipe going to the grey tank, and installed the plumbing. I used rubber seals (like green one shown in pic 1) on all the connections - the plastic seals that some of the fittings come with seem to have leakage problems that the rubber ones don't.

The finished product is shown in pic 2 and 3.

The wife is happy with the increased area under the sink and the water properly drains. The only thing left is fill that hole in the shelf that the old piping went through.

[Donna D.]

Nice, really nice! Wish I could hire you to do mine. I've stared at it until I'm blue in the face. I guess I'm just worried the glue will setup before everything is lined up properly. Sigh.

[tdf-texas]

There is only one glued connection in my installation - the ABS to SJ transition fitting. All the rest of the fittings are slip joint fittings (SJ) and allow a lot of latitude for fit-up. SJ piping is available in 45's, 90's, straight - all the fittings you should need to run your piping. Also, don't worry about using SJ fittings - they are standard for sink plumbing. Take a look under any sink in your house and you will see SJ fittings.

[ksitte]

Now you've done it! Another thing to add to my mod list.

Seriously, very nicely done and well planned.

[elongest]

I have installed a lot of Hepvo valves with no issues. Last spring I installed one to resolve my E-21 bath/shower drain issues with no problems. ETI tried using the Hepvo valves on the bath shower drains but complained of leaks. I replaced my kitchen sink last summer and ordered and used a Hepvo valve like in this thread. I too had leaking issues with the new valve. I pulled the valve connections apart and found the black rubber connection seals were dry. I lubed the rubber seals with silicone paste and no more leaks. For some reason the new valve seals are not being lubed. I recommend checking your connection seals for lubrication and if dry lube the seals in your new Hepvo valve. It will save you a little frustration when checking for leaks. BTW, this is a great mod.
Eddie

[Red Dog]

tom...Tom...TOM!!! I am all over this mod. Maybe Dave and I can do this at the Bluebonnet Rally. Are you going?


Fred M.

[Eggscape]

Like the space it creates but $54 on Amazon.ca is a little hard to justify for a plastic tube if everything is working fine...we will see.

[Donna D.]

Originally Posted by Eggscape

Like the space it creates but $54 on Amazon.ca is a little hard to justify for a plastic tube if everything is working fine...we will see.

IF you're still interested, I found this: Contact Drainmaster regarding HepvO

Send a message and maybe you'll find out where you can buy it either locally or a weblink in Canada.

[elongest]

Little House Customs sells them for $26.50 & shipping.

[Tonny LR]

Tom,
Very nice mod. Do you have to use any special tool to cut the lower port of the black pipe? It appears that there is no room for a saw to reach the corner of the cabinet to saw the pipe off. Please give advice to perform this tricky task. Thanks.

Tonny LR

[wetzk]

Originally Posted by Tonny LR

Tom,
Very nice mod. Do you have to use any special tool to cut the lower port of the black pipe? It appears that there is no room for a saw to reach the corner of the cabinet to saw the pipe off. Please give advice to perform this tricky task. Thanks.

Tonny LR

Can you use string?
We used to do that in our scada systems to cut plastic pipe when it was hard to access.
Nylon string cuts most plastic pipe as well as a saw.

[Tonny LR]

Wetzk,
Thanks for the suggestion to use string. What a great idea. Now I can attempt to do this mod. I appreciated your help.
Tonny LR

[Donna D.]

Tom, I see the Hepvo comes in 1-1/4 and 1-1/2 sizes. I hate to assume, so did you use the 1-1/2 size? TIA.

[tdf-texas]

Originally Posted by Tonny LR

Tom,
Very nice mod. Do you have to use any special tool to cut the lower port of the black pipe? It appears that there is no room for a saw to reach the corner of the cabinet to saw the pipe off. Please give advice to perform this tricky task. Thanks.

Tonny LR

I used a short bladed sawzall but it was close to not working. A cable saw would be a good choice. https://www.homedepot.com/p/General-...BoCoTAQAvD_BwE

[tdf-texas]

Originally Posted by Donna D.

Tom, I see the Hepvo comes in 1-1/4 and 1-1/2 sizes. I hate to assume, so did you use the 1-1/2 size? TIA.

1 1/2" Hepvo.

[Tonny LR]

Originally Posted by tdf-texas

I used a short bladed sawzall but it was close to not working. A cable saw would be a good choice. https://www.homedepot.com/p/General-...BoCoTAQAvD_BwE

Thank you for sharing your mod and using cable saw to cut the black pipe. I bought the parts from Larry for quick some time, but don't the idea as to how to tackle it. You showed me how to do it. Thank you very much.
Tonny LR

[Mary F]

Great job, Tom! We don't have any drainage issues in our 2015, but to gain more storage under the sink would be super. Thanks for your post, especially the great pics.

[Chotch]

Originally Posted by tdf-texas

I was never too happy with the ABS piping for the kitchen sink in my 2017 21'. The trap drain fitting was located where it was hard to empty without dumping water behind the paneling in the bottom cabinet. It seemed to take up a lot of space that could be used for storage. But more important than all these, the sink never seemed to drain well - if I turned up the faucet too high, the sink would flood.

After looking at the installation, I found that there should be a vent on the piping and there are a total of six 90 deg bends in the piping impeding the water flow. So I decided to fix it. As a Hepvo valve doesn't need a vent and only uses two 90's, that seemed the way to go.

I cut out the old piping (pic 1), then cut out a new hole in the shelf for the Hepvo pipe routing, glued a ABS to SJ transition to the pipe going to the grey tank, and installed the plumbing. I used rubber seals (like green one shown in pic 1) on all the connections - the plastic seals that some of the fittings come with seem to have leakage problems that the rubber ones don't.

The finished product is shown in pic 2 and 3.

The wife is happy with the increased area under the sink and the water properly drains. The only thing left is fill that hole in the shelf that the old piping went through.

🤔 It looks as if you could have mounted the hepvo valve vertically, if you could do that seems like a lot less likely to get a leak. Is there room for that? Can you mount those valves vertically?

[Donna D.]

Originally Posted by Chotch

🤔 It looks as if you could have mounted the hepvo valve vertically, if you could do that seems like a lot less likely to get a leak. Is there room for that? Can you mount those valves vertically?

Yes, the Hepvo can be mounted vertically. This is a pic Jim Bennett shared of his install.

[cpaharley2008]

i'm going to stick this thread, very helpful and informational.