Double Y coupling closed on top.

Hi.

It is in Ontario, Canada. Just in case here is a plumbing code doc http://ontario-building-code.com/Part7.pdf


There are two horizontal (with a required slope) 4" drainage pipes, that should connect to a vertical 4" pipe going down.

There is no vertical drainage pipe going up.

There are separate vents going up from left and right branches.

Is it possible to use a 4" Double Y coupling (like #6 on page 7 in http://ontario-building-code.com/Part7.pdf) to connect these branches to a downstream vertical 4" pipe, but without a vertical pipe going up. Just having the top orifice of the Double Y terminated with a very short piece of pipe and a cap?



thanks,
Mark

Here it would be legal - instead of the cap, you could also use a female threaded adapter and a plug...
If low enough this would allow the fitting to be used as a cleanout or allow future tie ins...

MarkX said:

Is it possible to use a 4" Double Y coupling (like #6 on page 7 in http://ontario-building-code.com/Part7.pdf) to connect these branches to a downstream vertical 4" pipe, but without a vertical pipe going up. Just having the top orifice of the Double Y terminated with a very short piece of pipe and a cap?

Click to expand...

In Ontario it is legal to use as you suggested , providing the branh fixtures will be vented.

On a side note, the fitting that you suggested has 1 major flaw (in my opinion). If the vertical drainage gets plugged and you try and snake it from the branch fixtures, the cable/snake may travel through to the other side, rather than go down to the verticle.

(this is only my opinion).If you plan to take this route, do what markts30 suggested and place a cleanout at the top where you plan to cap, otherwise the better fitting would be #8 on page 7