--- product_id: 12031191 title: "Watts Brass & Tubular #9D-M3 1/2 1/2\" Backflow Preventer" brand: "watts" price: "€ 204.80" currency: EUR in_stock: true reviews_count: 9 category: "Watts" url: https://www.desertcart.gr/products/12031191-watts-brass-and-tubular-9d-m3-1-2-1-2 store_origin: GR region: Greece --- # Reliable backflow prevention Suitable for hot & cold water 1/2 inch NPT union connection Watts Brass & Tubular #9D-M3 1/2 1/2" Backflow Preventer **Brand:** watts **Price:** € 204.80 **Availability:** ✅ In Stock ## Summary > 🚰 Keep your flow flawless — because clean water is non-negotiable! ## Quick Answers - **What is this?** Watts Brass & Tubular #9D-M3 1/2 1/2" Backflow Preventer by watts - **How much does it cost?** € 204.80 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/12031191-watts-brass-and-tubular-9d-m3-1-2-1-2) ## Best For - watts enthusiasts ## Why This Product - Trusted watts brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Universal Fit:** 1/2 inch union FNPT x FNPT connection designed for seamless integration with smaller supply lines - • **Precision Brass Build:** Durable brass body engineered for longevity and corrosion resistance - • **Tight Seal Technology:** Primary check valve with rubber disc ensures zero backflow, protecting your potable water - • **Versatile Application:** Ideal for labs, dairy, sterilizers, and boiler feed lines ensuring clean, uncontaminated water flow - • **Continuous Pressure Ready:** Built to withstand continuous pressure for uninterrupted performance ## Overview The Watts Brass & Tubular #9D-M3 1/2" Backflow Preventer is a robust, brass-bodied valve designed to prevent backflow in smaller supply lines. Featuring a 1/2 inch union FNPT connection and a rubber disc check valve, it ensures reliable protection for potable water in applications ranging from laboratory equipment to boiler feed lines. Suitable for both hot and cold water under continuous pressure, this device guarantees a tight seal and long-lasting performance. ## Description 1/2" Backflow Preventer Review: Go with the Flow…… - Worked like a charm and is a solid device. Tested it because I live a boring life and have nothing g else to do with my time. Plus. I did not want putrid hot water back flowing into my potable drinking water. Worked like a charm. Pay the premium - its worth it. Review: Great valve - Easy to install. Did it's job 👍. Ty ## Features - WATTS 0950053 Check Valve, 1/2 in, Union FNPT x FNPT, Brass Body - Specially made for smaller supply lines and ideally suited for laboratory equipment, processing tanks, sterilizers, dairy equipment and similar applications. - It is particularly recommended for boiler feed lines to prevent backflow when supply pressure falls below system pressure. - Suitable for use on hot or cold water and can be used under continuous pressure. - It features a primary check valve utilizing a rubber disc seating against a mating rubber part to ensure tight closing. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000KLHK16 | | Best Sellers Rank | #123,013 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #263 in Check Valves | | Brand | Watts | | Brand Name | Watts | | Color | Stainless Steel,Brass | | Connector Type | Union | | Customer Reviews | 4.4 out of 5 stars 168 Reviews | | Exterior Finish | Brass | | Included Components | 1/2" Backflow Preventer | | Item Dimensions | 4 x 3 x 2 inches | | Item Type Name | TV733156 | | Item Weight | 1.2 pounds | | Item dimensions L x W x H | 4 x 3 x 2 inches | | Manufacturer | Watts Brass & Tubular | | Manufacturer Part Number | 9D-M3-1/2 | | Material | Brass | | Material Type | Brass | | Model Number | 9D-M3 1/2 | | Number of Pieces | 1 | | Size | 1/2 inch | | Thread Type | NPT | | UPC | 098268676815 | | Unit Count | 1 Count | ## Product Details - **Brand:** Watts - **Color:** Stainless Steel,Brass - **Connector Type:** Union - **Exterior Finish:** Brass - **Item Weight:** 1.15 Pounds - **Item dimensions L x W x H:** 4 x 3 x 2 inches - **Material:** Brass - **Number of Pieces:** 1 - **Size:** 1/2 inch - **Thread Type:** NPT ## Images ![Watts Brass & Tubular #9D-M3 1/2 1/2" Backflow Preventer - Image 1](https://m.media-amazon.com/images/I/61cOWTVXLTL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Go with the Flow…… *by R***B on March 21, 2024* Worked like a charm and is a solid device. Tested it because I live a boring life and have nothing g else to do with my time. Plus. I did not want putrid hot water back flowing into my potable drinking water. Worked like a charm. Pay the premium - its worth it. ### ⭐⭐⭐⭐⭐ Great valve *by G***I on November 9, 2023* Easy to install. Did it's job 👍. Ty ### ⭐⭐⭐⭐⭐ Direct Replacement for 25-year old part. *by J***S on January 1, 2021* One of the few times the cheaper offering was what I needed. This back flow valve is one of four devices (other three are pressure valves) connected to one drain line on my boiler. Line was leaking badly and was the third thing I replaced that stopped the leaking. Encourage checking for an exact replacement for what you need. I soaked the fittings on the valve with WD-40 and it seemed to help when it was time to remove the old one. Also this particular valve came with a warning that its lead content was more than is recommended to connect to a potable water line - maybe the reason it is cheaper? ## Frequently Bought Together - Watts Brass & Tubular #9D-M3 1/2 1/2" Backflow Preventer - Bell and Gossett 110192 Fb-38 Pressure Reducing Valve - Hydro Master Automatic Air Vent Valve 1/8 Inch Brass --- ## 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.gr/products/12031191-watts-brass-and-tubular-9d-m3-1-2-1-2](https://www.desertcart.gr/products/12031191-watts-brass-and-tubular-9d-m3-1-2-1-2) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-08-27*