Tub Drain with 2" Trap?

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Tub Drain with 2" Trap?
Author: Dan0 (TN) I'm replacing a tub (standard 5', porcelain on steel) and I was thinking about using a 2" trap. Any advantages... or disadvantages? Thanks
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Re: Tub Drain with 2" Trap?
Author: hj (AZ) Easier to snake if it gets clogged.
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Re: Tub Drain with 2" Trap?
Author: North Carolina Plumber (NC) We have to use a 2" trap when the tub is sitting on a concrete slab.
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Re: Tub Drain with 2" Trap?
Author: Dan0 (TN) Thanks NC... 2" Tub Trap, 1.5" Wet Vent from Vanity...( vent will be above the 2 " tub inlet) Edited 4 times.
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Re: Tub Drain with 2" Trap?
Author: hj (AZ) NOW, you just changed the dynamics. It is one reason why giving advice without all the information is "dangerous". That vent above the tub inlet will be USELESS as far as the tub is concerned. IF the toilet is draining past the tub inlet the tub drain MUST have its own vent. Edited 1 times.
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Re: Tub Drain with 2" Trap?
Author: Dan0 (TN) So... when the toilet is flushed... it's going to try to suck the water out of the tub trap... Basically, the water rushing by the 2" inlet will flush the trap... just like the camode! Thanks - I was trying to keep it simple...
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Re: Tub Drain with 2" Trap?
Author: hj (AZ) It MAY drain the trap, not flush it.
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Re: Tub Drain with 2" Trap?
Author: Dan0 (TN) This has got to be one of the most common arrangements out there...
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Re: Tub Drain with 2" Trap?
Author: steve (CA) That sanitary tee, being used for the tub vent take-off, is not a legal fitting in that location. Should be a wye or combo tee.
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Thanks
Author: Dan0 (TN) Thanks! Edited 1 times.
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Re: Tub Drain with 2" Trap?
Author: Dan0 (TN) It's not a big deal to spend a couple extra bucks and put in the fitting that makes it legal... but I'm just curious why you would need a wye or combo for a dry vent.
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Re: Tub Drain with 2" Trap?
Author: steve (CA) Any vent piping, below 6" above the flood level of the fixture, shall be installed with approved drainage fittings, material and grade to drain. A sanitary tee is a drain fitting, however it's not legal to install it on it's back(like you have it), when used as a drain fitting.
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Re: Tub Drain with 2" Trap?
Author: Dan0 (TN) Something that is not in the picture... I plan to use a 3"Combo, on it's back, at the bottom of this assembly to go from the vertical drop to horizontal... and then tap into th main line. I'll put in a 3" cleanout on the backside. Do I need a combo, or is a sanitary tee ok? I think I've seen sanitary tee's used in this way... Thanks
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Re: Tub Drain with 2" Trap?
Author: steve (CA) A tee on it's back, used to convey wastes, needs to be a combo. Doesn't matter if the wastes are changing direction, vertical to horizontal or passing straight through with the vertical branch used for a vent.
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Thanks
Author: Dan0 (TN) Thanks! Edited 1 times.
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