What diameter is top mount where screws go in?

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

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

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.

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?

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.

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.

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

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🛁 Elevate your freestanding tub setup with flawless precision and lasting reliability!

DEBRIS PROOF DESIGN - Protective film over the opening keeps your rough-in stage clean and hassle-free.
WATERPROOFING READY - Compatible with waterproof membranes to safeguard your bathroom investment.
PREMIUM BRASS TAILPIECES - Threaded and flanged brass components guarantee long-lasting durability and leak resistance.
UNIVERSAL JOIST COMPATIBILITY - Designed for both 8" and 10" joist spaces with adaptable p-trap sizes (1.5"/2").
EFFORTLESS PRE TILE INSTALLATION - Install before tiling to avoid costly rework and ensure seamless integration.

The OS&B ITD35 Freestanding Bathtub Rough-In Kit by Thompson Traders is engineered for professional-grade installation in 8" or 10" joist spaces. Featuring brass tailpieces and an ABS plastic adapter, it ensures durability and corrosion resistance. Designed for pre-tile installation, it includes a protective film to prevent debris ingress and supports waterproof membrane integration, making it the smart choice for modern bathroom renovations.

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