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 Pipe Freestanding Tub Drain Kit & Rough-In - Easy Installation, Asymmetrical Deck Plate, Water, Air, & Smoke Testable - Designed for 8"/10" Joist Spaces & Tight Bathrooms

OS&B ITD35 - Two Piece ABS Pipe Freestanding Tub Drain Kit & Rough-In - Easy Installation, Asymmetrical Deck Plate, Water, Air, & Smoke Testable - Designed for 8"/10" Joist Spaces & Tight Bathrooms

Product ID: 25509747

Details

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

📏Fits 8"/10" joist spaces

🧱Durable ABS & brass build

🛠️30 psi test cap pressure

€ 277.19

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Description

🚿 Upgrade your bathroom game with the tub drain kit that fits tight spaces and tight schedules!

BUILT TO ENDURE - Robust ABS body and brass tailpiece ensure long-lasting, leak-proof performance.
TESTED TRUSTED - Snap-off cap supports water, air, and smoke testing up to 30 psi for peace of mind.
SPACE SAVVY DESIGN - Asymmetrical deck plate fits perfectly around freestanding faucets and narrow joists.
ALL IN ONE SOLUTION - Includes everything from adapters to tile guards—no last-minute trips to the hardware store.
EFFORTLESS INSTALLATION - Complete kit with cutting template for seamless setup in tight spaces.

The OS&B ITD35 Two Piece ABS Pipe Freestanding Tub Drain Kit is engineered for easy installation in compact bathrooms, fitting 8"/10" joist spaces with a low-profile asymmetrical deck plate. Made from durable ABS and brass components, it supports water, air, and smoke testing up to 30 psi, ensuring reliable performance. This comprehensive kit includes all necessary parts and a cutting template, making it the perfect choice for professional remodels and DIY upgrades alike.

Specifications

ASIN	B016M16DTC
Best Sellers Rank	#73,996 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #124 in Bathtub Drains
Brand Name	OS&B
Customer Reviews	4.7 4.7 out of 5 stars (808)
Global Trade Identification Number	00775439064526
Included Components	Rough-in Kit
Item Type Name	Freestanding Bathtub Rough-In Kit Brass Tail Pipe and ABS Plastic Adapter
Manufacturer	Oakville Stamping and Bending Ltd.
Material Type	Acrylonitrile Butadiene Styrene (ABS)
Maximum Pressure	30 psi
Outside Diameter	2 inches
UPC	775439064526
Unit Count	1 Count

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€ 277.19

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered 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 Greece.

Secure transaction

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