Metal drain shoe to PVC

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viral

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My tub is: Compare Princeton™ Princeton® Americast® 60 x 30-Inch Integral Apron Bathtub Right-Hand Outlet With Integral Drain model: 2391202ICH.020
How do I connect this bathtub's metal drain shoe to PVC? At the store, I was handed a PVC straight adapter; however, I have always been told to never attach PVC(female threads) to metal(male threads), as this would cause stress cracks and eventually fail. Another store suggested using a tailpiece with a metal Slip-Joint Nut (I think this is for a sink). This will be going into a single story home with a cement slab foundation.
Questions:
1. Will the female threaded PVC adapter fail due to stress? Or is that only something to worry about when the pipe is under pressure?
2. Is it safe to use a "sink" tailpiece in an inaccessible area?
3. Which is the best option?
Thanks

Below are photos. Hopefully they are uploaded in order.
1. My bathtub
2-4. Metal Drain Shoe
5. washer
6. Metal nut and tailpiece
7. Assembled using the tail piece and metal nut
8. Assembled using plastic PVC
9. slab/foundation/P-trap
 

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Jeff H Young

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the 1 1/2 straight female thread x glue fitting wont work with the metal tub spud you have( integral overflow) there should have been a black washer and nut to go on the bottom and seal against the tub.
I woudnt have bought that tub I think itll be a bear to install just go with a reguar tub and all plastic glue up waste and overflow its not going to be easy either but a regular 2391 right hand drain and replacew that p trap.
 

Breplum

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NO, tailpiece and any slip joint connection must be accessible. If no access, needs to be a glued waste and overflow and no hub or glued along down.
I do not advise that DIY try this. You made a mistake buying that tub without an access panel behind the drain...
 

viral

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the 1 1/2 straight female thread x glue fitting wont work with the metal tub spud you have( integral overflow) there should have been a black washer and nut to go on the bottom and seal against the tub.
I woudnt have bought that tub I think itll be a bear to install just go with a reguar tub and all plastic glue up waste and overflow its not going to be easy either but a regular 2391 right hand drain and replacew that p trap.
Thanks for your reply and concern. You are correct the tub did include the the parts to connect the drain shoe to the tub. Do you have an answer to my specific questions?
 

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viral

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NO, tailpiece and any slip joint connection must be accessible. If no access, needs to be a glued waste and overflow and no hub or glued along down.
I do not advise that DIY try this. You made a mistake buying that tub without an access panel behind the drain...
Thanks for your reply and concern. You suggest connecting PVC female threads to male metal threads? Will that not fail due to stress? If it will fail, would something like the picture below be appropriate? Also, I can access the tub through the wall behind it if I cut drywall.
 

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Tuttles Revenge

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I think I'm inclined to 2nd what others have mentioned above. Blind setting a tub on slab floor would be a LOT easier with a tub that has a glue together waste and overflow.

If you decided to forge ahead with the tub you have:

I believe what you are missing is a Straight Tub Shoe. It threads onto that metal straight threads and seals against the bottom of the tub with a rubber gasket.


However, as a blind set on slab, you're really going to have to get your trap moved under the drain and you'll have to glue the last fitting and get it lined up 100%
 

Jeff H Young

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I believe what you are missing is a Straight Tub Shoe. It threads onto that metal straight threads and seals against the bottom of the tub with a rubber gasket.

I've installed this tub a bunch of times and its not difficult. Just need the right parts.

However, as a blind set on slab, you're really going to have to get your trap moved under the drain and you'll have to glue the last fitting and get it lined up 100%
perhaps that will work , I guess youve used it I thought you used a nut and washer on the spud? then a tubular tail piece but suppose it will screw on with straight shoe or cut a little off the end.
He still has to put a new trap on and position but come to think of it he has no overflow to deal with so its actually easier than a regular tub. I hollow out a void in the dirt to give a little play for the trap to wiggle a few millimeters to line up.
He could actually use one of those expensive drain connections that are popular on freestanding tubs.
I am rightfully corrected no need to exchange tubs this wont be bad at all
 

viral

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I think I'm inclined to 2nd what others have mentioned above. Blind setting a tub on slab floor would be a LOT easier with a tub that has a glue together waste and overflow.

If you decided to forge ahead with the tub you have:

I believe what you are missing is a Straight Tub Shoe. It threads onto that metal straight threads and seals against the bottom of the tub with a rubber gasket.


However, as a blind set on slab, you're really going to have to get your trap moved under the drain and you'll have to glue the last fitting and get it lined up 100%
Thanks for the reply and addressing my questions. Sadly, the wife wants what the wife wants. I'm sure you all understand. I apologize to you all for not including the washer/nuts included with the drain shoe. I didn't notice them missing when I took the photos. Will the adapter titled Capture1.PNG pictured below be the correct part to transition to PVC? Its threads will not fail do to stress? or is there a better way?
 

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Jeff H Young

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Viral, I think tuttles was right you can probebly use the" straight tub shoe" with your drain. Ive never used one with that type but sounds doable if he says it works than I think it will too! a straight shoe is similar to a female adapter but not interchangeable they are differant the drain has straight threads not tapered pipe threads and the tub shoe has straight threads as well. you definately need a straight shoe to go with this unless you use the tubular tail piece which requires access
 

viral

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Finally received the Straight Tub Shoe. Quick question before I start installing this thing.
Do I install this with or without the brass nut? If it is with the brass nut, how does it make a seal? Pictures below
 

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viral

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Hopefully I did this correctly. The suggested part worked great. I did a leak test and everything is dry. Thanks again for the help guys. Wish I could buy you guys a beer.:)
 

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