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Originally Posted by dluna11w

This is more for my overall education, but can someone help me understand the deal with the 1.5" triplever kits. I will be 1.5" from the drain to the TEE for the triplever, but I could then go to 2" from there for the trap and down to where it comes into my 3" toilet drain. I guess I don't know enough about water flow, but it seems to me that if I am 1.5" from the drain to the TEE for the triplever kit, won't I be constrained to the amount of water that can flow. Will converting to 2" for the rest of the tub drain actually gain me anything? Again, the price to step up to 2" from 1.5" is definitely negligible, I just wonder if I am on the right track with my thinking.

THANKS AGAIN!

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I don't know why it's 1 1/2" instead of 2" most likely be because the tub shoe's only 1 1/2 ".(see image). You'll have to contact the manufacture and ask.
The 1 1/2" set up never bothered any of the other installed tubs why's it bothering you?

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Originally Posted by speedball1

I dunno why it's 1 1/2" instead of 2" most likely be because the tub shoe's only 1 1/2 ".(see image). You'll have to contact the manufacture and ask.
The 1 1/2" set up never bothered any of the other installed tubs why's it bothering you?

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Your picture describes exactly what I am talking about. Everything you have pictured in my setup is 1.5" As I'm sure you know it joins at a TEE and then you can begin the p-trap etc. I wouldn't say it is bothering me...I just like to have a good understanding of what is going on so that I can use that knowledge later on. EVERYTHING I have read calls for a 2" drain on a shower and since this is all 1.5", it is just making me wonder. Again, I could go convert the 1.5" to 2" right away before the p-trap...but I am trying to understand if it would actually allow more flow this way than with simply keeping it 1.5" until it reaches the toilet drain. Perhaps it is a little bit of my OCD shinning through :)

Thanks again for your assistance.

Dluna11w: You have very good point: Why don't tubs have 2" drain ? I wondered that myself many times before. It could certainly drain water lot faster than though 1 1/2" drain. However, that's the standard that was established long time ago and is holding on up to today. Perhaps, one day manufacturers will change it to 2".

Yes, we convert from 1 1/2" to 2" right above the trap.

Now, that being said: in my area, you are required 2" trap and drain for tub. So here you have it...

My code also mandates a 2" trap. [QUOTE][ I am trying to understand if it would actually allow more flow this way than with simply keeping it 1.5" until it reaches the toilet drain/QUOTE] Certainly a 2" pipe will allow more volume to pass then a 1 1/2" one but you must realize that when draining under gravity that the [pipe never completely fills with water and It isn't 1 1/2" all the way to the toilet brnch. It's 2" from the trap. Regards, Tom

Very good point , Tom...