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

Osb Itd35 Freestanding Bathtub Rough In Kit Brass Tail Pipe

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€ 222.08

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛁 Elevate your freestanding tub game with flawless, leak-proof precision!

DEBRIS PROOF DESIGN - Protective film keeps your rough-in clean and hassle-free
DURABLE BRASS ABS BUILD - Premium brass tailpieces paired with ABS adapters for leak-proof reliability
SMART INSTALLATION SUPPORT - Access 3D interactive instructions via the free BILT app for flawless setup
UNIVERSAL JOIST COMPATIBILITY - Designed for 8" and 10" joist spaces with perfect fit
EFFORTLESS PRE TILE INSTALLATION - Install before tile for seamless bathroom upgrades

The OSB ITD35 Freestanding Bathtub Rough-In Kit is a premium brass and ABS adapter system designed for easy pre-tile installation in 8" or 10" joist spaces. It includes a protective film to prevent debris contamination and offers 3D interactive assembly instructions through the BILT app, ensuring a smooth, leak-proof setup for modern freestanding tubs.

Specifications

ASIN	B016M16DTC
ASIN	B016M16DTC
Batteries Included?	No
Batteries Required?	No
Color	Brass
Customer Reviews	4.6 4.6 out of 5 stars (769)
Customer reviews	4.6 4.6 out of 5 stars (769)
Date First Available	20 October 2015
Date First Available	20 October 2015
Finish	brass
Included components	Rough-in Kit
Installation Method	Freestanding
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	930 g
Item model number	ITD35
Item model number	ITD35
Manufacturer	Thompson Traders, Inc.
Manufacturer	Thompson Traders, Inc.
Material	Brass
Part number	ITD35
Product Dimensions	23.83 x 23.83 x 10.49 cm; 930 g
Product Dimensions	23.83 x 23.83 x 10.49 cm; 930 g
Shape	Round
Size	SINGLE

Reviews

G**R

Great product

14.12.2025

M**O

I used this to install a freestanding tub (Berlin Rouge F1) with no access below - my kitchen is under my bathroom. This worked like magic, it was so easy - just tilted the tub into it - and most importantly nothing has leaked (it’s been 2 weeks).

6.05.2019

F**Y

Moins cher qu'à la plomberie. Vraiment une bonne qualité. Installation facile.

28.01.2024

A**X

Works great. the only problem is that it is very expensive. 80% of its price probably goes to its patent I guess, the materials itself doesn't worth that much.

10.09.2025

G**N

It was easy to install in the floor and the plumbing line. The tub drain slid easily into the OSB with the help of the supplied silicone lube. It's expensive but worth it.

2.04.2023

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