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Old 08-02-2010, 09:27 PM   #16
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4" drain for toilet?


It doesn't matter, the kid at HD got all 3 pieces wrong..... she didn't know... starting over......
*sigh* I'm not planning on anything being 3" though, the toilet flanges are for 4" pipe, let's go from there....
Under the floor, it will connect to a 10 or so inch 4" tube, then elbow over 3 or 4 feet to the drain, the other toilet will be only a 3 or so foot span to the double tee. The vent to the roof is the center of the tee up.
How can this not vent right?

DM

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Old 08-02-2010, 09:29 PM   #17
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4" drain for toilet?


btw, the double tee she brought is the white one pictured.... again.

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Old 08-02-2010, 09:58 PM   #18
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4" drain for toilet?


max length trap arm for a toilet is 6ft of developed length. So using that cross as a common vent for both toilets, your toilets could be 12' developed length from each other. Developed length means measuring down the pipe including fittings. Not from the vent to the fixture "as the crow flys". So yes it will vent right. The double y will not. You cannot use a wye to connect a trap arm to a vent stack. Simply put, the flowing waste water will not allow air back upstream to the trap because of the wye's design.
Hope that helps
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Old 08-02-2010, 10:15 PM   #19
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4" drain for toilet?


So I guess I need to 'special order' the black one in post #16, but in white pvc....
Then I can use elbows under the toilet's 4" 'down tube'? Then from the elbows to the tee?
The toilets will be less than 12' from each other. 5' one way, 3 or 4 the other.

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Old 08-02-2010, 10:44 PM   #20
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So....Lateral Concepts is wrong and I cannot USE the 3 pieces the wife already bought and paid for?????
AARGH!!! You're kidding, right? I HAD the white one already, that was wrong.... I don't think I can USE a black one with my white pvc without some special cement, and they don't have one anyways. How will the venting be any different using a double wye 4" 4 way? same thing basically, and the 4" vent is right in the middle of the two?
Confused again, as usual.....

DM
DM - I apologize if I told you incorrectly. As far as I knew a fixture cross was the same as a double WYE with 2 45's.

ePlumber - I do understand the sanitary cross not being conducive to cleaning (snaking)
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Old 08-02-2010, 11:00 PM   #21
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4" drain for toilet?


@ DM, I would try the 4x3 cross(double sanTee) first because of availability in your area. This will give you your 4" vent you say you to want.
The fixture will probably ship as 4x3x3x3. But you said you wanted 4" to your toilets and 4" vent.
Again, I can legally use either one in my area. Check with your inspector.

@ LC, anybody who has tried to cable any back to back fixtures, be it tubs, toilets, sinks or lavs knows about the dreaded cross
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Old 08-02-2010, 11:14 PM   #22
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4" drain for toilet?


We are not ALLOWED to use a sanitary cross when connecting fixtures back to back like that for all the reasons stated above about snaking and waste backing up the other side. We do double lavatories like this all the time, and the vent works just fine.

I understand the theory behind what you are talking about... having the vent come off a little lower than the top would theoretically reduce the allowable trap arm length, but like I said we aren't allowed to use that sancross fitting here except in venting.
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Old 08-02-2010, 11:16 PM   #23
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@ LC, anybody who has tried to cable any back to back fixtures, be it tubs, toilets, sinks or lavs knows about the dreaded cross
Unfortunately it's often learned by trial and error.

Glad to learn something new though about the difference between a double WYE and a fixture cross. I was under the impression a fixture cross was basically the same only 1 fitting instead of 3.
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Old 08-02-2010, 11:18 PM   #24
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4" drain for toilet?


P.S. reference for dangermouse :

http://www.plbg.com/forum/read.php?1,421272

good specs on each type of fitting listed at the bottom of that thread with measurements and everything.
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Old 08-02-2010, 11:26 PM   #25
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P.S. reference for dangermouse :

http://www.plbg.com/forum/read.php?1,421272

good specs on each type of fitting listed at the bottom of that thread with measurements and everything.
Thats a funny thread Nice find. Fixture cross is an off the shelf item at my supply houses -maybe not the box store- but they're not plumbers...
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Old 08-03-2010, 07:54 AM   #26
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4" drain for toilet?


Well, this is just peachy..... that forum has the picture of the sanitary cross... part #500.... in ABS ONLY! ...and nothing that's 4" all around either!
So how can I do this? I NEED to have all 4" because of problem stated earlier....
How are two toilets normally done? (without using 3" anything?)
I'm running out of good weather! lol

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Old 08-03-2010, 08:44 AM   #27
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4" drain for toilet?


Oh crap.... NOW I'm embarrassed.... The pipes down there ARE 3", not 4".... before, all I could do was look at the setup from 10' away with a flashlight.... they LOOKED like 4"!!! CRAPCRAPCRAP!!! Or should I say *WHEW*?
This explains a LOT to me, and NOW, since I need all 3" stuff, it'll be AVAILABLE (and cheaper too!)
Back to square 1! LOL

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Old 08-03-2010, 09:32 AM   #28
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4" drain for toilet?


OK then, this piece still needs to be ordered by the PS place, but is it the right one? I guess I'll start there....

DM
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Old 08-03-2010, 09:52 AM   #29
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4" drain for toilet?


double san tees are not allowed for back to back drainage as Allen and I stated above. My state does have an exception, but only a 4x4x3x3 qualifies in this case and you don't have a 4" drain line. So I have to say, no its not the right one
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Old 08-03-2010, 10:08 AM   #30
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