Question 1

What diameter is top mount where screws go in?

Accepted Answer

That’s a good question. I can’t remember the exact measurement but it’s somewhere around 10 inches.

Question 2

Will this work with 2” abs p-trap? States 1-1/2”/2” respectively in description, but want to be certain

Accepted Answer

I used a 2” abs p-trap. No issues there. The hard part came when I selected a tub drain, which came with a perfect reducer for the threaded brass tail pipe ( as shown in picture). The reducer was plastic, and I wanted brass. The tub drain manufacturer would not replace nor sell me a brass replacement, so I ordered one from a third party. The ITD35 was easy to install, and suits my needs perfectly. Just be careful choosing a tub drain.

Question 3

If I am laying cement board in between the plywood floor and tiles, do I screw the rough in to the plywood or the cement board?

Accepted Answer

I believe the directions with the product say to screw the rough in to the plywood. Mine is on the plywood, found that flat roofing nails caused less issues with the cement board layer than screws.

Question 4

If the p-trap gets backed up, will the seal prevent leakage? I am nervous of the slip in connection and a few years worth of time.

Accepted Answer

Good afternoon, that is a valid question, although should be directed toward the manufacture. Most issues in a tub are due to hair clogs and generally are limited to the strainer in the tub, not the ptrap. You should recognize the symptoms of a pending clog well in advance of a backup. . You should never get to this point, having two daughters with princess hair forces me to be proactive and remove the hair buildup. Regardless, and in my opinion, the seal in the slip connection is tight, although would not prevent leakage if pressure where present

ASIN	B016M16DTC
Best Sellers Rank	#73,996 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #124 in Bathtub Drains
Brand Name	OS&B
Customer Reviews	4.7 4.7 out of 5 stars (808)
Global Trade Identification Number	00775439064526
Included Components	Rough-in Kit
Item Type Name	Freestanding Bathtub Rough-In Kit Brass Tail Pipe and ABS Plastic Adapter
Manufacturer	Oakville Stamping and Bending Ltd.
Material Type	Acrylonitrile Butadiene Styrene (ABS)
Maximum Pressure	30 psi
Outside Diameter	2 inches
UPC	775439064526
Unit Count	1 Count

OS&B ITD35 Two-Piece ABS Island Tub Drain Rough-In Kit for 8/10-Inch Joists

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