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OS&B ITD35 Freestanding Bathtub Rough-In Kit Brass Tail Pipe and ABS Plastic Adapter

OS&B ITD35 Freestanding Bathtub Rough-In Kit Brass Tail Pipe and ABS Plastic Adapter

Q: 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.

Q: 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.

Q: 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.

Q: 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

Product ID: 350391451

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🔩Durable brass tailpieces & ABS adapters

🧱Pre-tile install with protective debris film

🛠️Precision fit for 8"/10" joist spaces

Frequently Bought Together

OS&B ITD35 ABS Island Tub Drain Rough-in for Freestanding Bathtub, Simplifies Installation, Water, Air, and Smoke Testable Tub Drain, Designed for 8"/10" Joist Space, Plumbing Supplies

DURATECH Inside Pipe Cutter with 2 Replaced Blades, for PVC and Plastic Pipe

Description

🛁 Elevate your bathroom build with precision and style—before the tile even hits!

WATERPROOF READY - Compatible with waterproofing membranes for ultimate protection
DEBRIS PROOF DESIGN - Protective film keeps your rough-in clean and hassle-free
PREMIUM MATERIAL MIX - Brass tailpieces paired with ABS adapters for lasting durability
OPTIMIZED JOIST COMPATIBILITY - Fits standard 8" and 10" joist spaces with ease
SEAMLESS PRE TILE INSTALLATION - Install confidently before tile for a flawless finish

The OS&B ITD35 Freestanding Bathtub Rough-In Kit by Thompson Traders is engineered for professional-grade installation, fitting standard 8" and 10" joist spaces. It includes brass tailpieces and ABS adapters, a protective film to prevent debris intrusion during rough-in, and supports waterproof membrane integration—ensuring a durable, clean, and efficient setup before tile installation.

Specifications

Manufacturer	Thompson Traders, Inc.
Country of Origin	USA
Item model number	ITD35
Product Dimensions	23.83 x 23.83 x 10.49 cm; 930 g
ASIN	B016M16DTC

Have a Question? See What Others Asked

What diameter is top mount where screws go in?

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

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?

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.

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