---
product_id: 239646155
title: "42725 Backwater Valve Device, 2-Inch"
brand: "oatey"
price: "€ 39.75"
currency: EUR
in_stock: true
reviews_count: 5
category: "Oatey"
url: https://www.desertcart.sk/products/239646155-42725-backwater-valve-device-2-inch
store_origin: SK
region: Slovakia
---

# 3.75-inch deep sump bowl capacity One-piece trap drain & cleanout 2-inch solvent weld pipe fit 42725 Backwater Valve Device, 2-Inch

**Brand:** oatey
**Price:** € 39.75
**Availability:** ✅ In Stock

## Summary

> 🚰 Upgrade your drain game — never fear backup again!

## Quick Answers

- **What is this?** 42725 Backwater Valve Device, 2-Inch by oatey
- **How much does it cost?** € 39.75 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/239646155-42725-backwater-valve-device-2-inch)

## Best For

- oatey enthusiasts

## Why This Product

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

## Key Features

- • **Dual-Function Design:** Innovative one-piece trap drain and cleanout simplifies maintenance and boosts reliability.
- • **Built-In 2-Inch FIP Threadway:** Ready to accommodate backwater devices for enhanced plumbing security.
- • **Maximized Backflow Protection:** Deep 3.75-inch sump bowl ensures superior sewage backup prevention.
- • **Compact & Durable Polypropylene Build:** Lightweight yet robust, engineered for long-lasting performance in demanding environments.
- • **Seamless 2-Inch Solvent Weld Connection:** Effortless integration with Schedule 40 DWV pipes for a leak-proof fit.

## Overview

The Oatey 42725 Backwater Valve Device is a precision-engineered 2-inch polypropylene valve designed to prevent sewage backflow while allowing efficient drainage. Featuring a deep 3.75-inch sump bowl and a one-piece trap drain/cleanout design, it seamlessly fits Schedule 40 DWV pipes with solvent weld connections and includes a built-in 2-inch FIP threadway for backwater device integration. Ideal for professionals seeking reliable, compact, and easy-to-maintain plumbing solutions.

## Description

Oatey 42725 Backwater Valve Device, 2-Inch : desertcart.in: Industrial & Scientific

Review: Fits my 1940's basement floor drain "P-Trap drain" just perfectly. Finally got the old one out and this dropped in like a charm. Be aware the rubber rim is thin and not robust material. The seal, when I originally installed it, was very good. However... I tried to lube it up with WD40 after it was installed, thinking that might tighten the seal, since it did upleak a tiny bit when my washing machine is trying to force-feed a tub-full of water down the basement drain (only enough to very slightly fill the drain's cup). However the WD40 corrupted the rubber, causing it to buckle & crinkle and therefore it started leaking way too much. I then tried Dupont Silicone spray, which is supposed to be safe on rubber. I guess it was the volatiles used in the spray delivery, because it buckled again and I had to replace it with a fresh one. Which, thanks to the low price of this item, is not painful. It would be nicer if this had a nice big faux-rubber "O" ring that could withstand some crap instead of a thin, obviously real-rubber skirt, but as long as I don't do anything stupid, I think the seal this provides is solid enough, and will hopefully last a while. Make sure to pair it with a water-leak alarm just in case ;) P.S. Yes my antique cast-iron 1939 version of this ball valve was difficult to get out... it was rusted in there good. Finally the light bulb came on, and I grabbed my sawz-all with a metal-cutting blade and cut a little chunk out of the old collar, after that I was able to chisel it loose and unscrew it. Just don't go deeper than necessary with the sawz-all to avoid damaging the threads in the female portion of the drain in the floor. Hope that helps -- it only took me 14 years to figure out how to get the old one out!! :)
Review: I am a contractor, I bought this thinking it would work, for the life of me I could not figure out what it did or how it worked, sent it back to desertcart

## Features

- Trap drain allows for drainage while preventing sewage backup
- Solvent weld over 2 in. Scheudle 40 DWV pipe
- One piece trap drain/cleanout design
- 3-3/4 in. deep sump bowl for large capacity
- Built in 2 in. FIP threadway for backwater device

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000BQWR1I |
| Brand | Oatey |
| Country of Origin | USA |
| Department | department |
| Exterior Finish | Polypropylene |
| Global Trade Identification Number | 00038753427256 |
| Inlet Connection Size | 2 Inches |
| Inlet Connection Type | Solvent |
| Item Dimensions LxWxH | 5.1 x 5.1 x 5.7 Centimeters |
| Item Weight | 22.7 g |
| Item dimensions L x W x H | 5.1 x 5.1 x 5.7 Centimeters |
| Item model number | 42725 |
| Manufacturer | 0 |
| Material | Polypropylene |
| Net Quantity | 1.0 Count |
| Number of Ports | 2 |
| Outlet Connection Size | 2 Inches |
| Outlet Connection Type | FIP |
| Product Dimensions | 5.08 x 5.08 x 5.72 cm; 22.68 g |
| Specification Met | ASTM |
| UPC | 038753427256 |

## Product Details

- **Brand:** Oatey
- **Exterior Finish:** Polypropylene
- **Inlet Connection Size:** 2 Inches
- **Inlet Connection Type:** Solvent
- **Item dimensions L x W x H:** 5.1 x 5.1 x 5.7 Centimeters
- **Material:** Polypropylene
- **Number of Ports:** 2
- **Outlet Connection Size:** 2 Inches
- **Outlet Connection Type:** FIP
- **Specification Met:** ASTM

## Images

![42725 Backwater Valve Device, 2-Inch - Image 1](https://m.media-amazon.com/images/I/31ekT+00GVL.jpg)
![42725 Backwater Valve Device, 2-Inch - Image 2](https://m.media-amazon.com/images/I/41Zp0MR6QWL.jpg)
![42725 Backwater Valve Device, 2-Inch - Image 3](https://m.media-amazon.com/images/I/41siMThRLaL.jpg)
![42725 Backwater Valve Device, 2-Inch - Image 4](https://m.media-amazon.com/images/I/71AzfxTjSFL.jpg)
![42725 Backwater Valve Device, 2-Inch - Image 5](https://m.media-amazon.com/images/I/71VZAPJZCzL.jpg)

## Questions & Answers

**Q: Is this a drain trap(pictured) or just a backwater valve?**
A: It is a trap with the option of having a ball check valve to prevent backwater.

**Q: Does the backwater device come with it?**
A: no you have to purchase it separately.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by R***N on 9 June 2018*

Fits my 1940's basement floor drain "P-Trap drain" just perfectly. Finally got the old one out and this dropped in like a charm. Be aware the rubber rim is thin and not robust material. The seal, when I originally installed it, was very good. However... I tried to lube it up with WD40 after it was installed, thinking that might tighten the seal, since it did upleak a tiny bit when my washing machine is trying to force-feed a tub-full of water down the basement drain (only enough to very slightly fill the drain's cup). However the WD40 corrupted the rubber, causing it to buckle & crinkle and therefore it started leaking way too much. I then tried Dupont Silicone spray, which is supposed to be safe on rubber. I guess it was the volatiles used in the spray delivery, because it buckled again and I had to replace it with a fresh one. Which, thanks to the low price of this item, is not painful. It would be nicer if this had a nice big faux-rubber "O" ring that could withstand some crap instead of a thin, obviously real-rubber skirt, but as long as I don't do anything stupid, I think the seal this provides is solid enough, and will hopefully last a while. Make sure to pair it with a water-leak alarm just in case ;) P.S. Yes my antique cast-iron 1939 version of this ball valve was difficult to get out... it was rusted in there good. Finally the light bulb came on, and I grabbed my sawz-all with a metal-cutting blade and cut a little chunk out of the old collar, after that I was able to chisel it loose and unscrew it. Just don't go deeper than necessary with the sawz-all to avoid damaging the threads in the female portion of the drain in the floor. Hope that helps -- it only took me 14 years to figure out how to get the old one out!! :)

### ⭐ Review
*by K***S on 13 May 2024*

I am a contractor, I bought this thinking it would work, for the life of me I could not figure out what it did or how it worked, sent it back to Amazon

### ⭐⭐⭐⭐⭐ Review
*by K***Z on 11 June 2025*

Easy peasy. You put it in your floor drain, it stops back flows during storm surges etc. Hasn't been through a big storm yet but looks like it should work in theory.

## Frequently Bought Together

- Oatey 42725 Backwater Valve Device, 2", White
- Minimprover Internal Backwater Valve,2-F 2" Float Model Flood-Guard for 2-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection
- General Specialties Flood-Guard for 2" Flood Drains

---

## 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.sk/products/239646155-42725-backwater-valve-device-2-inch](https://www.desertcart.sk/products/239646155-42725-backwater-valve-device-2-inch)

---

*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-05-16*