---
product_id: 286326340
title: "OSB ITD35 Freestanding Bathtub Rough-In Kit Brass Tail Pipe and ABS Plastic Adapter"
brand: "os&b"
price: "€ 222.08"
currency: EUR
in_stock: true
reviews_count: 5
category: "Os&B"
url: https://www.desertcart.gr/products/286326340-osb-itd35-freestanding-bathtub-rough-in-kit-brass-tail-pipe
store_origin: GR
region: Greece
---

# Fits 8"/10" joist spaces 3D interactive BILT app guide Precision brass tailpieces OSB ITD35 Freestanding Bathtub Rough-In Kit Brass Tail Pipe and ABS Plastic Adapter

**Brand:** os&b
**Price:** € 222.08
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** OSB ITD35 Freestanding Bathtub Rough-In Kit Brass Tail Pipe and ABS Plastic Adapter by os&b
- **How much does it cost?** € 222.08 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/286326340-osb-itd35-freestanding-bathtub-rough-in-kit-brass-tail-pipe)

## Best For

- os&b enthusiasts

## Why This Product

- Trusted os&b brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **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

## Overview

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.

## Description

ITD35 is a Freestanding tub rough-in kit (install before tile installation)

Review: Great product
Review: 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).

## Features

- ITD35 is a Freestanding tub rough-in kit (install before tile installation)
- Designed to be installed in an 8"/10" joist space with 1-1/2"/2" p-trap respectively
- Includes: island drain assembly with 1-1/2 inch DWV ABS tailpiece, cutting template & protective Film over opening keeps out debris during rough-in stage and
- Supplied with brass tailpieces (threaded and flanged) and ABS waste/overflow adaptor kit
- Can be installed with waterproofing membrane.3D interactive assembly instructions for this product are available through the free BILT app.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| 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 |

## Images

![OSB ITD35 Freestanding Bathtub Rough-In Kit Brass Tail Pipe and ABS Plastic Adapter - Image 1](https://m.media-amazon.com/images/I/61XZuFB+e3L.jpg)

## Questions & Answers

**Q: What diameter is top mount where screws go in?**
A: 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**
A: 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?**
A: 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.**
A: 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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by G***R on 14 December 2025*

Great product

### ⭐⭐⭐⭐⭐ Review
*by M***O on 6 May 2019*

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).

### ⭐⭐⭐⭐⭐ Review
*by F***Y on 28 January 2024*

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

## 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.gr/products/286326340-osb-itd35-freestanding-bathtub-rough-in-kit-brass-tail-pipe](https://www.desertcart.gr/products/286326340-osb-itd35-freestanding-bathtub-rough-in-kit-brass-tail-pipe)

---

*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-07-01*