Can I use a specialty CPVC fitting in a DWV application?

[Makemenuconfig]

I know PVC and CPVC usually don't mix. But I'm running out of options here. I'm roughing in a shower and am extremely limited on vertical height / slope.

I have a horizontal 3" trunk which the 2" shower drain is joining. I can make 1/4" pitch on the 2" pipe if (and only if) I use an eccentric 3x2 reducer. If I use a bushing or standard reducer, I only get a heavy 1/8" pitch.

I've ordered a fitting from Spears, the P102-338E which is exactly this. However the supply house has sent the similar eccentric reducer in sch. 40. This internal diameter isn't right, it creates a lip which will clog and hold water. I really need the DWV version here. The supply house has tried to send it 4 times, each time sending the wrong part.

I found one on Ebay, which is exactly what I want. An eccentric 3x2 reducer for DWV with the correct internal diameter for drainage. However it is a surplus custom part from Spears made for some HVAC manufacturer and is a DWV fitting made out of CPVC. I'm not really sure if I should go for it.

What do you think?

CPVC 3” x 2” DWV Eccentric Reducer Coupling- offset adapter elbow pvc drain PVC | eBay

Find many great new & used options and get the best deals for CPVC 3” x 2” DWV Eccentric Reducer Coupling- offset adapter elbow pvc drain PVC at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[Reach4]

Also at https://www.supplyhouse.com/Spears-429-338E-3-x-2-PVC-Schedule-40-Eccentric-Reducer

https://www.supplyhouse.com/Spears-P102-338E-3-x-2-PVC-DWV-Eccentric-Reducer-Coupling

so it is not something weird.

 

[Sponsor]

 

[John Gayewski]

This should be easy enough to get. Not sure why your having trouble.

 

[Makemenuconfig]

Yes, SupplyHouse.com is where I'm ordering. 449-338E is a schedule 40 water fitting, it does not have the proper internal geometry for DWV, it creates a lip. See attached photo (looking through 2" hole into 3" pipe, note the lip in the direction of flow created by 3" pipe).

P102-338E is what I want. But SupplyHouse.com has tried to send it to me 4 times, every time I have received the 449-338E part, so it seems they don't actually carry it.

The last replacement I got I asked them to put a note on the order for the packer to actually check the part number on the fitting. They took about a week of "looking into the inventory problem" and said it was fixed. And today I receive the 449-338E part again. I can't really wait much longer. Ferguson and the local places don't seem to carry this either.

 

[John Gayewski]

Yes, SupplyHouse.com is where I'm ordering. 449-338E is a schedule 40 water fitting, it does not have the proper internal geometry for DWV, it creates a lip. See attached photo (looking through 2" hole into 3" pipe, note the lip in the direction of flow created by 3" pipe).

P102-338E is what I want. But SupplyHouse.com has tried to send it to me 4 times, every time I have received the 449-338E part, so it seems they don't actually carry it.

The last replacement I got I asked them to put a note on the order for the packer to actually check the part number on the fitting. They took about a week of "looking into the inventory problem" and said it was fixed. And today I receive the 449-338E part again. I can't really wait much longer. Ferguson and the local places don't seem to carry this either.


View attachment 85810

Ferguson should be able to order it for you.

 

[Tuttles Revenge]

Fernco makes Eccentric fittings that might work.


Add a stainless Sheer Ring shield around it to keep it rigid.

 

[Reach4]

On the shear rings, would that replace the existing clamps, or could it go on over or between the original clamps?

 

[Tuttles Revenge]

On the shear rings, would that replace the existing clamps, or could it go on over or between the original clamps?

The shear ring is in addition to the outside hose clamps. They're what makes their strong back couplers rigid.

Probably just as hard or harder to find this Eccentric fitting as it would be to fill in the void of the CPVC or PVC Sch 40 fitting with an epoxy putty and smooth it to fill the gap...

 

[wwhitney]

Fernco makes Eccentric fittings that might work.

Your link is broken for some reason. It should be:

1056-32EB - Eccentric Series | Fernco - US

www.fernco.com

That picture makes the fitting look hollow, but I assume it's not? For DWV you'd obviously want to avoid a place for water to pool.

Also, even with a shear ring, the fitting would not be approved for above ground use. So an effective solution, just not a code approved one.

Cheers, Wayne

 

[Tuttles Revenge]

Thanks Wayne, I fixed the link. Because the fitting is intended for DWV / Sewer applications, it will be built so that each pipe rests against a stop in the center of the rubber fitting or may not have the stop, but still won't have a depression or divot in the center.

 

[Jeff H Young]

never used one plumbing or seen one . but pipefitting used tons of eccentrics butt weld fittings very common

 

[Tuttles Revenge]

never used one plumbing or seen one . but pipefitting used tons of eccentrics butt weld fittings very common

Same.. I just end up researching tons of product for work and for this forum so I see a LOT of basically useless fittings that look neat and would solve a bunch of problems, but you'll never ever install because nobody stocks them.

 

[Jeff H Young]

Same.. I just end up researching tons of product for work and for this forum so I see a LOT of basically useless fittings that look neat and would solve a bunch of problems, but you'll never ever install because nobody stocks them.

Right on Tuttles same here but we undoubtedly lear a lot from it !
I remember a hospitol job we had a long run of vent piping in cieling across building where the vent increased from 2 inch to 3 inch inspector called it because water can pool up and not drain down. an eccentric would have worked

 

[Makemenuconfig]

Update: Ferguson didn't even have the P102 fitting in their system. I was able to get ahold of a fabricated fitting through a site called "pvc fittings online" and it's going to work perfect.

3" x 2" Sch 40 PVC Eccentric Reducer Coupling Soc 429-338FE

PVC Fittings Online has this 3" x 2" Sch 40 PVC Eccentric Reducer Coupling Soc 429-338FE in stock now! Order online for speedy shipping.

www.pvcfittingsonline.com

 

[Jeff H Young]

Fernco makes Eccentric fittings that might work.


Add a stainless Sheer Ring shield around it to keep it rigid.

View attachment 85905

Never saw the stainless "shear ring" for sale I wonder if those are extra long as a fernco usually is?

 

[wwhitney]

Never saw the stainless "shear ring" for sale I wonder if those are extra long as a fernco usually is?

If you look at the flyer in the link given, seems clear that the shear rings shown are the part that makes a 10XX-YY underground coupling into a 10XX-YYRC underground coupling. The former just have two hose-clamp type securements, one at each end, while the latter have 4 clamps with a solid metal shield between the inner pair of clamps. So the shear ring is just the middle two clamps connected to the solid metal shield.

Cheers, Wayne

 

[Jeff H Young]

If you look at the flyer in the link given, seems clear that the shear rings shown are the part that makes a 10XX-YY underground coupling into a 10XX-YYRC underground coupling. The former just have two hose-clamp type securements, one at each end, while the latter have 4 clamps with a solid metal shield between the inner pair of clamps. So the shear ring is just the middle two clamps connected to the solid metal shield.

Cheers, Wayne

got it its still illegal to use above ground within the building