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 Approved double fitting for sinks side by side.
Author: rraynoobie (CA)

Hello all,

I am looking for an approved double fitting for sinks that are side by side, 2'-6" from CL to CL so I can use a common vertical vent. This is the California code I am adhering to.



My autoCAD catalog only has a Double Fixture Tee and no Double San Tap Tee, so in this instance I used a Double Fixture Tee, which I believe is also called a Figure 5. So I would like to know if this set up would be ok in the state of California.



Thanks guys, appreciate the help.

Noobie

Post Reply

 Re: Approved double fitting for sinks side by side.
Author: North Carolina Plumber (NC)

You need a back to back fixture fitting. CHARLOTTE Mfr Part No PVC005001000HA
The one you have pictured is not approved in that situation because it creates a partial S-trap on the sinks.

Post Reply

 Re: Approved double fitting for sinks side by side.
Author: hj (AZ)

A figure 5 IS a back to back, (or side by side), fixture fitting. The one you CANNOT use is a double combo, because THAT fitting creates 3/4 "S" traps.

Post Reply

 Re: Approved double fitting for sinks side by side.
Author: rraynoobie (CA)

Thanks guys,

I will have to look around for the correct fitting in autoCAD.

I appreciate the help.

RR

Post Reply

 Re: Approved double fitting for sinks side by side.
Author: hj (AZ)

You have a figure 5 so it IS the correct fitting.

Post Reply

 Thanks :)
Author: rraynoobie (CA)

Ahhh. Gotcha HJ (AZ). That helps me a lot and saves me time for finding a fitting I don't need.

Thanks again,

RR



Edited 1 times.

Post Reply

 Re: Thanks :)
Author: Don411 (NY)

HJ, what's the difference between the double wye that's pictured in the original post and this fitting? They look like they do the same thing.





Edited 1 times.

Post Reply

 Re: Thanks :)
Author: rraynoobie (CA)

So I don't have a double combo in PVC in my CAD catalog, which my first picture is, but i do have the two fittings in cast iron, no hub.



With my units set at 1/8", the dimension i'm pulling off the branches of the double combo to where the top connects to the vertical pipe on the top is quite a bit smaller then that of the figure 5, cast iron no hub. I am not qualified to give an answer, but my best guess is that where the vertical vent begins has to be higher of that of the inlet of the trap to the fixture.

Anyway, i appreciate the feedback.

RR



Edited 1 times.

Post Reply

 Re: Thanks :)
Author: sum (FL)

The double fixture fitting is a good compromise between a double sanitary tee or cross, and a double TY or combo.

With a back to back sanitary tee, you have the problem of the snake shooting over to the other side when you pass a snake down one side.

with a double combo or TY, the relative heights of the trap outlet elevation and the vent inlet point elevation is such that an S-trap will be formed and siphoning occur.

The double fixture fitting is one that avoids the snake from shooting across and still have a vent inlet point high enough.

Post Reply

 Re: Thanks :)
Author: hj (AZ)

The branches of the double combo attach to the barrel at a lower point which is what creates the 3/4 "S" trap when it is used improperly. The fitting he showed IS a "figure 5" which is the proper fitting for connecting two fixtures at the same level.

Post Reply

 Re: Thanks :)
Author: hj (AZ)

The top of the fitting relative to the branches has ABSOLUTLEY NOTHING to do with whether it is the correct fitting or not. WHERE they connect to the barrel of the riser is the important thing.

Post Reply

 Re: Thanks :)
Author: hj (AZ)

It is NOT a "compromise". It is the only approved fitting for that purpose, assuming the code enforcers are astute enough to read the code correctly.

Post Reply

 Re: Thanks :)
Author: sum (FL)

hj, I have actually had a situation that I could have used such a fitting but there is not a place locally that carries it (actually I called and they don't even know what I was talking about).

I referred to them as a "Double Fixture Fitting" or Charlotte's part no. 500. But even local supply houses have no idea what I mean. They said "Oh a sanitary cross" I said no, then they said a "double wye", I said no..,but the "arms" hang a little lower then the cross, but not as low as a wye :think: they think I am nuts.

Post Reply

 Re: Thanks :)
Author: sum (FL)

My understanding is that it is the point in red (on the inside of the fitting) that is the key.



Is there a "proper" name for this point? I call this the vent inlet or intake elevation but may be there is an official name for it, like "branch armpit point" :laugh:



Edited 1 times.

Post Reply

 Re: Thanks :)
Author: hj (AZ)

They are NOT very good plumbing wholesalers, since EVERY "good" wholesaler would know what you are asking about.

Post Reply

 Re: Thanks :)
Author: hj (AZ)

It is the "vent connection point" which has to be above the trap's weir.

Post Reply

 Re: Thanks :)
Author: hi (TX)

Sum I would call that the Axilla of the Wye.

Post Reply





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