For DWV on a single vanity to double vanity conversion. Which to use?

Double sanitary:
http://images.grainger.com/images/pr...MALL-1WHU8.JPG

Double fixture:
http://images.grainger.com/images/products/1CNT8.JPG

Hello, the double fixture tee is what you want to use.

In my area, our Code mandates use of cross sanitary T as shown in photo #1.

As far as dimensions go, you cas use 2"x 2" x 1 1/2" x 1 1/2" Tee, meaning drain and vent are 2" and horizontal drains arms leading to your sinks will be 1 1/2".

Hmmm... conflicting opinions. Sounds like either may be OK?

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For DWV on a single vanity to double vanity conversion. Which to use?

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I'm wondering! Are you planing on installing back to back lavatories like in separate bathrooms or are you wanting to install side by side, his and hers bowls? Let me know. Tom

Side by side, his & her sinks.

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Originally Posted by nc8861

Side by side, his & her sinks.

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Ahhh! Then neither fitting would be used. Both Milo and Truck figured on a back to back installation. I did too at first, the fittings through us off.
You have options here. 1) you can come off the stubout with a wye and pick up both tubs with their own traps **or** 2) you may use either a center outlet or a end outlet continuous waste, (see images) and pick both up with a single trap. By the way, those two fittings are called a "Double Sanitary Tee" and a Double Combination Wye and Eighth bend. Good luck, Tom

Huh? I'm confused now.

I don't think I can do #2 (if I'm understanding what you mean) because the new vanity has center drawer supports. I don't understand #1.

I was hoping to do something like this one that I found over at the Terry Love forums...
http://www.terrylove.com/forums/atta...1&d=1218029214

... and you didn't attach any images.

The photo in Terry Love forum is exactly how it should be done: nice and clean job. I cannot which cross T he used but in my area we would use Cross San T for this installation

OK! Now it becomes clearer. Most his and hers lavatories are close in side by side and a continuous waste is called for. If the vanities are to be in a wider spread, such as shown, then a double sanatary tee should be used to pick them up. You don't see the continuous wastes I put up in my last post? They're on the bottom left. Sorry for the confusion. Tom

I'm not sure what qualifies as wider spread or close in, but our vanity will be 60". Probably not as wide as the one in Terry's photo. But almost exactly the same layout with studs, drain, and vent piping. So I'll go with the double sanitary tee.

Don't worry about "wide" spread. With 60" vanity, you will go only 15" on each side of Cross T. That's nothing to talk about...

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Originally Posted by nc8861

I'm not sure what qualifies as wider spread or close in, but our vanity will be 60". Probably not as wide as the one in Terry's photo. But almost exactly the same layout with studs, drain, and vent piping. So I'll go with the double sanitary tee.

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Good choice. We use continuous wastes to pick up close side by side lavatories. When they're farther apart then use the double sanitary tee to pick up both tubsTom

I agree I have always been told to use a double sanitary tee by inspectors. The other fitting will block vent.

Plum1.You're responding to a dead thread. Look in the upper left hand corner for the date. Perhaps your coder mandates a trap for each tub but ours allows a continues waste. Saves on both fittings and labor. Regards, Tom