Any issue with having a "double" P-trap?

Machine_Ruse

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EDIT: I've moved on from this question as I've learned a little more and now have a new question (separate post).

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I'll skip the long and frustrating story on how I got to this point, but here is my current situation:

I am installing a freestanding bathtub made of stone resin in my master bath. The tub weighs about 300 lbs., and it is getting placed in a corner with only about 3-4" of clearance on two sides. This makes it impossible to get people situated around the tub in order to lift it straight up and straight down, which is what is required when using one of those drain rough-in kits which friction fit the tailpiece coming off of the tub. Unfortunately, my contractor did not take this into account, so the finished floor is in and the rough-in is directly below the location of the bathtub drain with no way to lower the tub into place (only one of the reasons why he is no longer in the picture).

So I need to make the connection from underneath, which means opening up my kitchen ceiling. Since this is my kitchen ceiling, I do not want to turn the opening into an access panel and I will close it back up properly once I am convinced nothing is leaking.

This is my concern: If I make the drain connections with rigid pipe, the bathtub cannot ever be removed without reopening the ceiling AND there is no room for play if the bathtub were to be accidentally moved out of place. Since it is pretty heavy, it would take more than a casual bump to move it, but $#it happens. For these reasons, I am considering using a long piece of flex pipe to connect the tub to the p-trap, with the excess length basically creating a coil between the two connections. This would allow the tub to be tilted up to disconnect the drain if necessary, and it would also eliminate (or at least reduce) the possibility of the connection being broken if the tub were to be accidentally shoved out of place.

Would having that excess flex pipe coil, or even basically form a second p-trap, create any problems I should be aware of?

I'm open to other solutions, but I've racked my brain trying to come up with something else, and I got nada.

- Finished floor is in
- Rough in drain is directly below the location of the bathtub drain
- Rough in drain cannot be removed without opening the ceiling below
- Due to adjacent shower, there is no room to build or use a hoist to raise and lower bathtub

Thanks in advance for any assistance!
 
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