--- product_id: 544304662 title: "WeCooper Plug-in Backflow Flap DN 100 mm Extractor Ventilation Hood Galvanised Steel with Sealing Rubber Aluminium Flaps Ball Valve" brand: "wecooper" price: "153 zł" currency: PLN in_stock: true reviews_count: 6 category: "We Cooper" url: https://www.desertcart.pl/products/544304662-wecooper-plug-in-backflow-flap-dn-100-mm-extractor-ventilation store_origin: PL region: Poland --- # One-way airflow with automatic flap Galvanised steel + aluminium + stainless steel build DN 100 mm plug-in size WeCooper Plug-in Backflow Flap DN 100 mm Extractor Ventilation Hood Galvanised Steel with Sealing Rubber Aluminium Flaps Ball Valve **Brand:** wecooper **Price:** 153 zł **Availability:** ✅ In Stock ## Summary > 🚀 Upgrade your airflow game with WeCooper’s smart backflow flap! ## Quick Answers - **What is this?** WeCooper Plug-in Backflow Flap DN 100 mm Extractor Ventilation Hood Galvanised Steel with Sealing Rubber Aluminium Flaps Ball Valve by wecooper - **How much does it cost?** 153 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/544304662-wecooper-plug-in-backflow-flap-dn-100-mm-extractor-ventilation) ## Best For - wecooper enthusiasts ## Why This Product - Trusted wecooper brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Noise-Reducing Seals:** Inner rubber and outer foam seals minimize sound and guarantee airtight operation. - • **Versatile Application:** Ideal for tumble dryers, bathrooms, garages, AC units, cooker hoods, and ventilation systems. - • **One-Way Airflow Control:** Automatically opens to vent out air while blocking cold drafts—no more energy loss. - • **Durable Industrial Materials:** Galvanised steel casing, aluminium blades, and stainless steel shaft ensure long-lasting performance. - • **Precision Fit Plug-in Design:** Effortlessly integrates with 4-inch exhaust hoses for seamless installation. ## Overview The WeCooper Plug-in Backflow Flap DN 100 mm is a robust ventilation accessory designed to fit standard 4-inch ducts. Featuring a galvanised steel housing, aluminium blades, and stainless steel components, it ensures durability and reliable one-way airflow control. Its automatic folding valve prevents cold air ingress while reducing noise through advanced sealing. Perfect for a variety of home and industrial ventilation needs, it offers easy installation and a 24-month warranty for peace of mind. ## Description Plug-in check valve DN 100 extractor. Especially suitable for plugging into exhaust hose. Perfect for use in tumble dryers, bathrooms, garages, air conditioners, fans, cooker hoods, ventilation systems. The folding valve opens and closes automatically and allows only one air flow in one direction, preventing cold air from entering. When the blind is mounted, the flap leaves open only in the direction of the outflowing air. The shaft axle must be vertical when installing the backflow flap and best installed in a horizontal position and inserted completely into the pipe. This also applies to vertical installation. The housing of the flap is made of galvanised sheet steel. The valve blades are made of aluminium. Shaft and spring are made of stainless steel. The inner rubber seal is used for better tightness and noise reduction. The outer foam sealing strip ensures a good seal and fixation of the backflow flap in the channel. The flap valve can be inserted directly into a non-flexible metal or plastic channel, but for a flexible duct, you need to use steel pipe clamps to secure the check valve. You can't go wrong with purchasing this slide-in backflow flap. Please contact us directly if you have any questions. We will reply within 2 hours. Review: Good product, a bit over priced - Works just fine Review: Very well made, all dimensions correct, perform perfectly ( although I'm using it with AEG kitchen hood which in full trhotle pumps 700 cubic meters of air per hour, on lowest settings probably about 150 ) with it works perfectly.Spring holding back draft flap is quite strong, than if someone going to use it with not as such powerful units (like washing air dryers etc) might not be suitable, but it's just my guess, can't tell for sure, you need to baisycly try it. ## Features - Plug-in check valve DN 100 extractor. Especially suitable for plugging into exhaust hose. Perfect for use in tumble dryers, bathrooms, garages, air conditioners, fans, cooker hoods, ventilation systems - The folding valve opens and closes automatically and allows only one air flow in one direction, preventing cold air from entering. When the blind is mounted, the flap leaves open only in the direction of the outflowing air. The shaft axle must be vertical when installing the backflow flap and best installed in a horizontal position and inserted completely into the pipe. This also applies to vertical installation - The casing of the flap is made of galvanised sheet steel. The valve blades are made of aluminium. Shaft and spring are made of stainless steel - The inner rubber seal is used for better tightness and noise reduction. The outer foam sealing strip ensures a good seal and fixation of the backflow flap in the channel. The flap valve can be inserted directly into a non-flexible metal or plastic duct, but for a flexible duct, you will need to use steel pipe clamps to secure the check valve - We have a 24-month warranty. You can't go wrong with purchasing this slide-in backflow flap. Please contact us directly if you have any questions. We will reply within 2 hours ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09H5DBB7W | | ASIN | B09H5DBB7W | | Best Sellers Rank | #80,776 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #110 in Heating & Cooling Ducting Products | | Brand Name | WeCooper | | Connector Type | Threaded | | Customer Reviews | 4.4 4.4 out of 5 stars (1,178) | | Customer reviews | 4.4 4.4 out of 5 stars (1,178) | | Date First Available | 26 December 2021 | | Exterior Finish | Stainless Steel | | Inlet Connection Size | 4 Inches | | Inlet Connection Type | Female Iron Pipe | | Item model number | 208672c9-b911-4d76-a6cc-85e645db2f22 | | Manufacturer | WeCooper | | Manufacturer | WeCooper | | Material Type | short | | Model Number | 208672c9-b911-4d76-a6cc-85e645db2f22 | | Number of Ports | 2 | | Outlet Connection Size | 4 Inches | | Outlet Connection Type | G Connector | | Package Dimensions | 11.5 x 11.4 x 6.5 cm; 80 g | | Set Name | Single | | Size | 100mm standard | | Smart Home Compatibility | Not Smart Home Compatible | | Specification Met | EN 10204, EN 10206 | | Thread Size | 4 inches NPT | | Thread Type | Thread | | UPC | 700721629978 | | Unit Count | 1 Count | | Valve Type | Check Valve | ## Product Details - **Brand:** WeCooper - **Exterior finish:** Stainless Steel - **Inlet connection size:** 4 Inches - **Inlet connection type:** Female Iron Pipe - **Material:** short ## Images ![WeCooper Plug-in Backflow Flap DN 100 mm Extractor Ventilation Hood Galvanised Steel with Sealing Rubber Aluminium Flaps Ball Valve - Image 1](https://m.media-amazon.com/images/I/51SrnFkhhoL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good product, a bit over priced *by S***D on 29 August 2025* Works just fine ### ⭐⭐⭐⭐⭐ Review *by G***G on 16 October 2025* Very well made, all dimensions correct, perform perfectly ( although I'm using it with AEG kitchen hood which in full trhotle pumps 700 cubic meters of air per hour, on lowest settings probably about 150 ) with it works perfectly.Spring holding back draft flap is quite strong, than if someone going to use it with not as such powerful units (like washing air dryers etc) might not be suitable, but it's just my guess, can't tell for sure, you need to baisycly try it. ### ⭐⭐⭐⭐⭐ Review *by J***N on 11 March 2026* Parfait et très silencieux ## Frequently Bought Together - WeCooper 100mm - 4 inch Connector with Backdraught Shutter, Non-Return Damper Flap to Connect Duct Pipe or Flexible Hose Pipe - TUPARKA 4 Pack Large Size Metal Hose Clips 91-114 mm Adjustable Ducting Clamps for Securing Hoses and Pipes Tube - Manrose, MF100T, black --- ## 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.pl/products/544304662-wecooper-plug-in-backflow-flap-dn-100-mm-extractor-ventilation](https://www.desertcart.pl/products/544304662-wecooper-plug-in-backflow-flap-dn-100-mm-extractor-ventilation) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-24*