--- product_id: 354911096 title: "Internal Backwater Valve,4-F 4\" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection" brand: "minimprover" price: "583 kr" currency: NOK in_stock: true reviews_count: 5 url: https://www.desertcart.no/products/354911096-internal-backwater-valve-4-f-4-float-model-flood-guard store_origin: NO region: Norway --- # 4-inch float valve seal Quick screwdriver install Solid brass durability Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection **Brand:** minimprover **Price:** 583 kr **Availability:** ✅ In Stock ## Summary > 🚨 Stop floods before they start—install the ultimate backwater valve today! ## Quick Answers - **What is this?** Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection by minimprover - **How much does it cost?** 583 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.no](https://www.desertcart.no/products/354911096-internal-backwater-valve-4-f-4-float-model-flood-guard) ## Best For - minimprover enthusiasts ## Why This Product - Trusted minimprover brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Unmatched Durability:** Crafted from solid brass for corrosion resistance and long-lasting performance. - • **Mess-Free Maintenance:** Minimize property damage and cleanup with a smart, proactive flood defense system. - • **Effortless Installation:** Get flood-guarding peace of mind in minutes with just a screwdriver—no plumber needed. - • **Reliable Seal Technology:** Embedded molded rubber gaskets ensure a tight, slip-free seal against water backup. - • **Precision Flood Protection:** 4-inch float model automatically seals drains to prevent costly sewer backflow damage. ## Overview The Internal Backwater Valve 4-F 4" Float Model Flood-Guard is a robust flood prevention device designed for 4-inch drains. Made from solid brass with molded rubber gaskets, it automatically seals off sewer backflow using a float mechanism. Easy to install with just a screwdriver, it protects your property from costly water damage and messy cleanups. ## Description ★ Great Material: The main parts are made of solid brass which is durable and corrosion resistant.The gaskets are made of molded rubber which is soft and durable. ★ Adventage: ***1.Very easliy to install just need a screwdriver. ***2.Help reduce losses, and some messy cleanup work. ***3.The embeded gasket provides strong seal without slipping. ***4.Solid brass construction for unsurpassed durability. ★ Package includes: 1Pack 2" Float Model Flood-Guard. ## Features - ★ 【Material】: The main parts are made of solid brass which is durable and corrosion resistant.The gaskets are made of molded rubber which is soft and durable. - ★ 【SIZE】: 4-F 4" Float Model Flood-Guard for 4-inch Flood Drains. - ★ 【Introduction】: Flood-Guard operates like a check valve to seal off water back-up caused by overloaded sewers. Water flows normally through the drain until the sewer begins to back up. Then the Flood-Guard float rises to seal off the drain opening until the water recedes. - ★ 【Adventage】: A screwdriver and a couple of minutes are all you need to install a Flood-Guard. Once in place, it can prevent property damage and a very messy clean-up job. - ★ 【Package Include】: 1Pack 4" Float Model Flood-Guard. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B08QHZ1YFQ | | Best Sellers Rank | #780 in Household Drain Openers | | Date First Available | 17 February 2021 | | Item Model Number | H087-4 | | Manufacturer | Minimprover | | Package Dimensions | 10.31 x 10.21 x 9.3 cm; 358 g | ## Product Details - **Brand:** Minimprover - **Exterior finish:** Brass - **Inlet connection size:** 4 Inches - **Inlet connection type:** Standard Pipe Thread - **Material:** Brass Rubber ## Images ![Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Image 1](https://m.media-amazon.com/images/I/61l9DzIp9kL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Well made. *by on Reviewed in the United States 1 September 2026* Well made, works great. Because the old floor drain had rusted during the last 80 years the opening was larger than 2 inches. I used a 2 part epoxy putty to fill the gaps…after cleaning everything very well. If you are putting this in an old steel or cast iron floor drain, getting it to fit may take a little creativity, but this is a well made back flow preventer that will work in 2 inch or slightly larger floor drains. ### ⭐⭐⭐⭐⭐ This is the tool for the job *by on Reviewed in Australia 3 July 2023* Everything else I could find for this size range is simply not performing up to the expected degree. This one does the job and does the job well ### ⭐⭐⭐⭐⭐ Works and price was good *by on Reviewed in Canada 8 September 2024* I purchased the 3" version and it fit perfectly. I saw reviews saying they could not control the water going down. There is nothing to adjust really on this. The 4 screws around makes the rubber expand the form a solid seal inside the pipe so that it cannot just be pulled or pushed out. The middle screw should not have to be adjusted. The water goes down with weight. If you have a cup of water it will not go down so press the button and down it goes but if there is a bucket, the weight pushes it down and allows it to drain. Hope this makes sense. For me, it works perfectly and what I needed. I installed one in a garage drain and now will order a second for the laundry room drain.Depending where you are and your situation, you could use these instead of putting a main one where you will have to dig. In my case there are only two small drains in the basement so it makes sense. ## Frequently Bought Together - Minimprover Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Dreyoo 1 Pcs 3 Inch End of Pipe Gripper Mechanical Plug, Steel Drain Pipe Cover with Galvanized Screw and Wing Nut for Outdoor Sewer Cleanout Drain - Oatey 33403 4-in. End of Pipe Gripper Mechanical Plug with Galvanized Screw and Wing Nut, 4 Inch, Red --- ## 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.no/products/354911096-internal-backwater-valve-4-f-4-float-model-flood-guard](https://www.desertcart.no/products/354911096-internal-backwater-valve-4-f-4-float-model-flood-guard) --- *Product available on Desertcart Norway* *Store origin: NO* *Last updated: 2026-09-17*