OS&B ITD35 Freestanding Bathtub Rough-in Kit Brass Tail Pipe and ABS Plastic Adapter, Red & Black, Single

OS&B ITD35 Freestanding Bathtub Rough-in Kit Brass Tail Pipe and ABS Plastic Adapter, Red & Black, Single

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: 417871628

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🔧Brass tailpieces for durability

🛁Fits 8"/10" joist spacing

🛡️Lifetime warranty protection

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 game with hassle-free, pro-grade installation!

WATERPROOFING READY - Compatible with waterproof membranes for a leak-proof finish
DEBRIS PROOF INSTALLATION - Protective film keeps rough-in opening clean during construction
DURABLE BRASS ABS COMBO - Threaded brass tailpieces paired with ABS adapters for long-lasting reliability
EFFORTLESS FREESTANDING TUB SETUP - Install before tiling to save time and avoid costly rework
PRECISION FIT FOR STANDARD JOISTS - Designed for 8" and 10" joist spaces with compatible p-traps

The OS&B ITD35 Freestanding Bathtub Rough-in Kit streamlines your bathroom upgrade by enabling quick, precise installation of freestanding tubs. Engineered for standard joist sizes, it features durable brass tailpieces and ABS adapters, a protective debris shield, and compatibility with waterproof membranes—all backed by a lifetime warranty for peace of mind.

Specifications

Manufacturer	Thompson Traders, Inc.
Part Number	ITD35
Product Dimensions	23.83 x 23.83 x 10.49 cm; 1.12 kg
Item model number	ITD35
Size	SINGLE
Colour	Red & Black
Style	ITD35 - ABS
Finish	ABS
Material	ABS
Shape	Round
Installation method	Freestanding
Item Package Quantity	1
Included Components	Rough-in Kit
Batteries included?	No
Batteries Required?	No
Item Weight	1.12 kg

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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