--- product_id: 270164782 title: "Oatey 42725 2 in. Backwater Valve Device for Integral Trap Shower Drain" brand: "oatey" price: "167.25 DT" currency: TND in_stock: true reviews_count: 5 category: "Oatey" url: https://www.desertcart.tn/products/270164782-oatey-42725-2-in-backwater-valve-device-for-integral-trap store_origin: TN region: Tunisia --- # 2-inch FIP threaded connection Durable PVC construction Backwater valve prevents sewage backup Oatey 42725 2 in. Backwater Valve Device for Integral Trap Shower Drain **Brand:** oatey **Price:** 167.25 DT **Availability:** ✅ In Stock ## Summary > 🛠️ Upgrade your drain game—stop backflow before it starts! ## Quick Answers - **What is this?** Oatey 42725 2 in. Backwater Valve Device for Integral Trap Shower Drain by oatey - **How much does it cost?** 167.25 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/270164782-oatey-42725-2-in-backwater-valve-device-for-integral-trap) ## 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 - • **Trusted Oatey Quality:** Backed by over a century of plumbing expertise, ensuring professional-grade durability and performance. - • **Low-Maintenance PVC Build:** Corrosion-resistant and easy to clean, designed to keep your drainage system running smoothly without fuss. - • **Compact & Lightweight Design:** At just 23g and 5.1cm dimensions, it fits snugly without bulk—ideal for tight spaces and vintage drains. - • **Reliable Backwater Protection:** Engineered to stop sewage backflow, safeguarding your basement and bathroom from unwanted backups. - • **Seamless 2-Inch FIP Threaded Fit:** Effortless installation with standard female iron pipe threads—perfect for quick upgrades or replacements. ## Overview The Oatey 42725 2-inch Backwater Valve is a precision-engineered PVC valve with female iron pipe threading, designed to convert your integral trap shower drain into a backwater valve. It prevents sewage backup while allowing normal drainage, fitting vintage and modern plumbing setups with ease. Lightweight and compact, it offers professional-grade reliability trusted by plumbers for over 100 years. ## Description Oatey Integral Floor Drain with P-Trap is available with an optional backwater device that transforms the drain into a backwater valve, allowing drainage while preventing sewage backup. Oatey products have earned the trust of plumbing professionals for over 100 years. 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 - Included Components: Plumbing Fixtures, Tub And Shower Faucets And Accessories, Bathroom Sink And Tub Drain Strainers - Product Type: Tools - Package Quantity: 1 - No Batteries Required ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000BQWR1I | | Brand | Oatey | | Brand Name | Oatey | | Connector Type | FIP, Threaded | | Customer Reviews | 4.5 out of 5 stars 80 Reviews | | Exterior Finish | Stainless Steel | | Exterior finish | Stainless Steel | | Global Trade Identification Number | 00038753427256 | | Included Components | Plumbing Fixtures;Tub and Shower Faucets and Accessories;bathroom-sink-and-tub-drain-strainers | | 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 centimeters | | Item Type Name | Backwater Valve | | Item Weight | 23 g | | Item dimensions L x W x H | 5.1 x 5.1 x 5.7 centimeters | | Manufacturer | Oatey | | Manufacturer Part Number | 42725 | | Material | pvc | | Material Type | pvc | | Model Number | 42725 | | Number of Pieces | 1 | | Number of Ports | 2 | | Outlet Connection Size | 2 Inches | | Outlet Connection Type | FIP | | Set Name | False | | Size | 2 Inch | | Smart Home Compatibility | Not Smart Home Compatible | | Specification Met | ASTM | | Thread Size | 2 inches | | Thread Type | FIP | | UPC | 038753427256 | | Unit Count | 1 Count | | Valve Type | Backwater Valve | ## Product Details - **Brand:** Oatey - **Exterior finish:** Stainless Steel - **Inlet connection type:** threaded - **Item dimensions L x W x H:** 5.1 x 5.1 x 7.6 centimeters - **Material:** pvc ## Images ![Oatey 42725 2 in. Backwater Valve Device for Integral Trap Shower Drain - Image 1](https://m.media-amazon.com/images/I/71AzfxTjSFL.jpg) ![Oatey 42725 2 in. Backwater Valve Device for Integral Trap Shower Drain - Image 2](https://m.media-amazon.com/images/I/818yhVj32lL.jpg) ![Oatey 42725 2 in. Backwater Valve Device for Integral Trap Shower Drain - 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 --- ## 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.tn/products/270164782-oatey-42725-2-in-backwater-valve-device-for-integral-trap](https://www.desertcart.tn/products/270164782-oatey-42725-2-in-backwater-valve-device-for-integral-trap) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-07-23*