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

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

Product ID: 25509747

Details

Brand
OS&B
Global Trade Identification Number
Manufacturer
Oakville and
Material
Acrylonitrile
Maximum Pressure
30 psi
Outside Diameter
2 inches

💧Snap-off test cap rated to 30 PSI for water/air/smoke testing

📏Fits 8/10-inch joists with low-profile asymmetrical deck

🛠️Two-piece ABS design for easy install

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Description

🚿 Upgrade your tub drain game—install smarter, test easier, last longer!

BUILT TO ENDURE - Durable PVC body ensures long-lasting performance under finished floors
SPACE SAVVY DESIGN - Asymmetrical deck plate fits tight layouts and freestanding faucets without interference
TEST WITH CONFIDENCE - Snap-off cap supports 30 PSI water, air, and smoke testing before final setup
EFFORTLESS REMODEL READY - Two-piece ABS kit includes all components for seamless bathroom upgrades
COMPLETE INSTALLATION KIT - Includes brass tailpiece, PVC adapters, mortar guard, and cutting template for precision

The OS&B ITD35 Two-Piece ABS Island Tub Drain Rough-In Kit is engineered for professional-grade bathroom remodels, fitting standard 8/10-inch joists with a low-profile asymmetrical deck plate. Its durable PVC construction supports freestanding tub installations over finished floors, while the snap-off test cap enables reliable 30 PSI water, air, and smoke testing. This comprehensive kit includes all necessary components for a precise, hassle-free installation, making it a top choice for modern bathroom projects.

Specifications

ASIN	B016M16DTC
Best Sellers Rank	#80,724 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #111 in Bathtub Drains
Color	Black & Red
Customer Reviews	4.7 4.7 out of 5 stars (807)
Date First Available	October 12, 2015
Finish	ABS
Included Components	Rough-in Kit
Installation Method	Freestanding
Item Package Quantity	1
Item Weight	2.09 pounds
Item model number	ITD35
Manufacturer	Oakville Stamping and Bending Ltd.
Material	Acrylonitrile Butadiene Styrene (ABS)
Part Number	ITD35
Product Dimensions	9.38 x 9.38 x 4.13 inches
Style	ITD35 - ABS

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₨4682

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Seychelles.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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