---
product_id: 263987344
title: "Oatey 42725 Backwater Valve Device, 2-Inch"
brand: "oatey"
price: "€ 28.35"
currency: EUR
in_stock: false
reviews_count: 5
category: "Oatey"
url: https://www.desertcart.ie/products/263987344-oatey-42725-backwater-valve-device-2-inch
store_origin: IE
region: Ireland
---

# 2-inch backwater valve fit Polypropylene ball & seal for reliable backup prevention ASTM-certified durability Oatey 42725 Backwater Valve Device, 2-Inch

**Brand:** oatey
**Price:** € 28.35
**Availability:** ❌ Out of Stock

## Summary

> 🚫💧 Stop backups before they start — your plumbing’s silent guardian!

## Quick Answers

- **What is this?** Oatey 42725 Backwater Valve Device, 2-Inch by oatey
- **How much does it cost?** € 28.35 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/263987344-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

- • **Built to Last:** Crafted from high-grade polypropylene and PVC materials, delivering long-term durability and corrosion resistance.
- • **Compact & Lightweight:** At just 40.8 grams and 5 cm dimensions, it’s a discreet yet mighty addition to your home’s defense.
- • **Certified Peace of Mind:** Meets ASTM standards, guaranteeing trusted performance and safety in your plumbing setup.
- • **Flood Defense, Activated:** Transforms your floor drain into a powerful backwater valve to stop sewage backups before they start.
- • **Precision Fit, Zero Hassle:** Designed for 2-inch LPS female threaded throats, ensuring seamless installation with your existing drain system.

## Overview

The Oatey 42725 Backwater Valve Device is a compact, ASTM-certified plumbing component designed to convert standard 2-inch floor drains into reliable backwater valves. Made from durable polypropylene and PVC, it features a precision-fit male LPS connection and a sealing ball mechanism to prevent sewage backup and flooding, ensuring long-lasting protection for your home’s drainage system.

## Description

The product is easy to use. The product is highly durable and handle. The product is manufactured in china.

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

- The Oatey floor drain with P-trap conforms with ASTM requirements
- An optional backwater device transforms the drain into a backwater valve that allows drainage but prevents sewage backup
- 2 inches, male lps polypropylene backwater device, with polypropylene ball & sealing ring, 1 header bag, prevents flooding due to back up, for use in the 1 piece or similar drain with 2 inches lps female threaded throat

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Oatey |
| Part Number | 42725 |
| Product Dimensions | 5.08 x 5.08 x 7.62 cm; 40.82 g |
| Item model number | 42725 |
| Size | 2 inches |
| Material | Polyvinyl Chloride (PVC) |
| Item Package Quantity | 1 |
| Number of Pieces | 1 |
| Certification | ASTM |
| Batteries included? | No |
| Batteries Required? | No |
| Item Weight | 40.8 g |

## Product Details

- **Material:** Polyvinyl Chloride (PVC)
- **Brand:** Oatey
- **Item dimensions L x W x H:** 5.1 x 5.1 x 7.6 centimetres
- **Exterior finish:** Stainless Steel
- **Inlet connection size:** 2 Inches
- **Inlet connection type:** threaded
- **Outlet connection type:** FIP
- **Number of ports:** 2
- **Outlet connection size:** 2 inches
- **Specification met:** ASTM

## Images

![Oatey 42725 Backwater Valve Device, 2-Inch - Image 1](https://m.media-amazon.com/images/I/31ekT+00GVL._AC_US100_.jpg)
![Oatey 42725 Backwater Valve Device, 2-Inch - Image 2](https://m.media-amazon.com/images/I/41Zp0MR6QWL._AC_US100_.jpg)
![Oatey 42725 Backwater Valve Device, 2-Inch - Image 3](https://m.media-amazon.com/images/I/41siMThRLaL._AC_US100_.jpg)
![Oatey 42725 Backwater Valve Device, 2-Inch - Image 4](https://m.media-amazon.com/images/I/71AzfxTjSFL._AC_SL1500_.jpg)
![Oatey 42725 Backwater Valve Device, 2-Inch - Image 5](https://m.media-amazon.com/images/I/71AzfxTjSFL._AC_SX679_.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

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-01*