--- product_id: 263987344 title: "Oatey 42725 Backwater Valve Device, 2-Inch" brand: "oatey" price: "€ 44.21" currency: EUR in_stock: true reviews_count: 5 category: "Oatey" url: https://www.desertcart.be/products/263987344-oatey-42725-backwater-valve-device-2-inch store_origin: BE region: Belgium --- # 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:** € 44.21 **Availability:** βœ… In Stock ## Summary > πŸš«πŸ’§ Stop backups before they start β€” your plumbing’s silent guardian! ## Quick Answers - **What is this?** Oatey 42725 Backwater Valve Device, 2-Inch by oatey - **How much does it cost?** € 44.21 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/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 - β€’ **Built to Last:** Crafted from high-grade polypropylene and PVC materials, delivering long-term durability and corrosion resistance. - β€’ **Compact & Lightweight:** At just 40.8 grams and 5 cm dimensions, it’s a discreet yet mighty addition to your home’s defense. - β€’ **Certified Peace of Mind:** Meets ASTM standards, guaranteeing trusted performance and safety in your plumbing setup. - β€’ **Flood Defense, Activated:** Transforms your floor drain into a powerful backwater valve to stop sewage backups before they start. - β€’ **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: 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 - 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 | |---------------|-------| | ASIN | B000BQWR1I | | Brand | Oatey | | Connector Type | Threaded | | Country of Origin | China | | Customer Reviews | 4.5 out of 5 stars 82 Reviews | | Exterior Finish | Stainless Steel | | Exterior finish | Stainless Steel | | Global Trade Identification Number | 00038753427256 | | Inlet Connection Size | 2 Inches | | Inlet Connection Type | Female Iron Pipe | | Inlet connection size | 2 Inches | | Inlet connection type | Female Iron Pipe | | Item Dimensions | 5.1 x 5.1 x 5.7 centimetres | | Item Weight | 0.05 Pounds | | Item dimensions L x W x H | 5.1 x 5.1 x 5.7 centimetres | | Manufacturer | Oatey | | Material | Polyvinyl Chloride (PVC) | | 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 | | Part Number | 42725 | | Set Name | White | | Size | 2 inches | | Specification Met | ASTM | | Thread Size | 2 inches | | Thread Type | FIP | | UPC | 038753427256 | | Unit Count | 1.0 count | | Valve Type | Backwater Valve | ## 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/71AzfxTjSFL.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 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/263987344-oatey-42725-backwater-valve-device-2-inch](https://www.desertcart.be/products/263987344-oatey-42725-backwater-valve-device-2-inch) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-10-30*