---
product_id: 239646155
title: "Oatey 42725 Backwater Valve Device, 2-Inch"
brand: "oatey"
price: "€ 36.26"
currency: EUR
in_stock: true
reviews_count: 5
category: "Oatey"
url: https://www.desertcart.it/products/239646155-oatey-42725-backwater-valve-device-2-inch
store_origin: IT
region: Italy
---

# 3.75-inch deep sump bowl capacity One-piece trap drain/cleanout design 2-inch solvent weld & FIP thread Oatey 42725 Backwater Valve Device, 2-Inch

**Brand:** oatey
**Price:** € 36.26
**Availability:** ✅ In Stock

## Summary

> 🚫💧 Stop Backflow Before It Starts — Protect Your Space Like a Pro!

## Quick Answers

- **What is this?** Oatey 42725 Backwater Valve Device, 2-Inch by oatey
- **How much does it cost?** € 36.26 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/239646155-oatey-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

- • **Seamless 2-Inch Fit:** Precision solvent weld and FIP threading for effortless installation on standard Schedule 40 DWV pipes.
- • **Integrated Trap & Cleanout:** One-piece design simplifies maintenance and keeps your drainage system running flawlessly.
- • **Durable Polypropylene Build:** Lightweight yet robust material engineered to resist corrosion and wear for long-lasting reliability.
- • **Maximized Backflow Protection:** Deep 3.75-inch sump bowl ensures superior capacity to prevent sewage backup, safeguarding your space.
- • **Perfect Vintage Compatibility:** Ideal retrofit for older homes with legacy floor drains, blending modern tech with classic plumbing.

## Overview

The Oatey 42725 Backwater Valve Device is a 2-inch polypropylene valve designed for easy solvent weld installation on Schedule 40 DWV pipes. Featuring a deep 3.75-inch sump bowl and integrated trap drain/cleanout, it effectively prevents sewage backup while simplifying maintenance. Its standard 2-inch FIP threading ensures compatibility with both modern and vintage plumbing systems, making it a reliable, durable solution for professional-grade backflow protection.

## Description

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

Review: Works well if you don't screw it up like I did - 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: Take no backwater! - The float ball in my 40 year-old, cast-iron floor drain somehow broke. No plumber here, so, what to do? Considered breaking the concret floor and replacing drain unit with same-shaped ABS unit. At some point, I realized the old ball was held in place by a ring which was a separate piece from the drain itself. After using hammer, chisel, and hacksaw blades, I managed to get the brass ring out, preserving the threads. Searched for suitable replacement and came upon this. Let's hear it for standard threads! This screwed right in to where I had removed the 40 year-old original. Perfect fit and function!

## 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 |
| Brand Name | Oatey |
| Connector Type | connector_type |
| Country of Publication | USA |
| Customer Reviews | 4.5 out of 5 stars 81 Reviews |
| Exterior Finish | Polypropylene |
| Global Trade Identification Number | 00038753427256 |
| Inlet Connection Size | 2 Inches |
| Inlet Connection Type | Solvent |
| Item Dimensions | 5.1 x 5.1 x 5.7 Centimeters |
| Item Weight | 0.05 Pounds |
| Item dimensions L x W x H | 5.1 x 5.1 x 5.7 Centimeters |
| Manufacturer | 0 |
| Manufacturer Part Number | 42725 |
| Material | Polypropylene |
| Material Type | Polypropylene |
| Model Number | 42725 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Number of Pieces | 1 |
| Number of Ports | 2 |
| Outlet Connection Size | 2 Inches |
| Outlet Connection Type | FIP |
| Size | 2 inches (W) x 2 inches (L) x 2.25 inches (H) |
| Specification Met | ASTM |
| Thread Size | 2 inches |
| Thread Type | FIP |
| UPC | 038753427256 |
| Unit Count | 1.0 Count |
| Valve Type | backwater valve |

## 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

![Oatey 42725 Backwater Valve Device, 2-Inch - Image 1](https://m.media-amazon.com/images/I/71AzfxTjSFL.jpg)
![Oatey 42725 Backwater Valve Device, 2-Inch - Image 2](https://m.media-amazon.com/images/I/818yhVj32lL.jpg)
![Oatey 42725 Backwater Valve Device, 2-Inch - Image 3](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

### ⭐⭐⭐⭐⭐ Works well if you don't screw it up like I did
*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!! :)

### ⭐⭐⭐⭐⭐ Take no backwater!
*by H***3 on 27 February 2026*

The float ball in my 40 year-old, cast-iron floor drain somehow broke. No plumber here, so, what to do? Considered breaking the concret floor and replacing drain unit with same-shaped ABS unit. At some point, I realized the old ball was held in place by a ring which was a separate piece from the drain itself. After using hammer, chisel, and hacksaw blades, I managed to get the brass ring out, preserving the threads. Searched for suitable replacement and came upon this. Let's hear it for standard threads! This screwed right in to where I had removed the 40 year-old original. Perfect fit and function!

### ⭐⭐⭐⭐⭐ Really Simple Back Flow Preventer
*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

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-10-19*