--- product_id: 409695865 title: "Neverest® RK Non-return Flap 100 mm Automatic Non-return Flap For Pipe Installation Pipe Connector Galvanized Steel with Sealing Rubber Aluminum Valves" brand: "neverest" price: "€ 41.91" currency: EUR in_stock: true reviews_count: 5 category: "Neverest" url: https://www.desertcart.gr/products/409695865-neverest-rk-non-return-flap-100-mm-automatic-non-return store_origin: GR region: Greece --- # Automatic backdraft shutter with stainless steel springs Rubber sealing ensures 100% quiet, airtight closure Galvanized steel housing for ultimate durability Neverest® RK Non-return Flap 100 mm Automatic Non-return Flap For Pipe Installation Pipe Connector Galvanized Steel with Sealing Rubber Aluminum Valves **Brand:** neverest **Price:** € 41.91 **Availability:** ✅ In Stock ## Summary > 🚀 Elevate your airflow game with neverest® – where durability meets silent precision! ## Quick Answers - **What is this?** Neverest® RK Non-return Flap 100 mm Automatic Non-return Flap For Pipe Installation Pipe Connector Galvanized Steel with Sealing Rubber Aluminum Valves by neverest - **How much does it cost?** € 41.91 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/409695865-neverest-rk-non-return-flap-100-mm-automatic-non-return) ## Best For - neverest enthusiasts ## Why This Product - Trusted neverest brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Galvanized steel and aluminum blades deliver unmatched robustness for your ventilation system. - • **Versatile Fit:** Designed exclusively for metal ducts, compatible with all common 100mm round ventilation pipes. - • **Trusted Expertise:** Backed by 40+ years of ventilation mastery, ensuring reliable performance and easy installation. - • **Whisper-Quiet Seal:** Rubber ring guarantees silent operation and perfect airtightness—no more noisy ducts. - • **Smart Airflow Control:** Automatic shutter opens with exhaust airflow and closes instantly to block unwanted drafts. ## Overview The neverest® RK 4 inch Backdraft Shutter is a premium galvanized steel ducting connector featuring aluminum damper blades and stainless steel springs for automatic, silent closure. Designed exclusively for metal ducts with 100mm diameter, it prevents unwanted air backflow while ensuring quiet, airtight sealing. Ideal for HVAC, ventilation, and heat recovery systems, this robust component is backed by over 40 years of industry expertise. ## Description connector,pipe connector,4 inch pipe connector,metal hose connector, connector,ducting connector hose connector,vent connector,backdraft shutter,backdraught shutter,backdraft shutter 100mm,100mm backdraft shutter, bathroom tumble chimney blocker drain draught heater inline draughts internal back water wall washing machine grill system stopper flexible hose pipe vent cover back draft shutter 100mm returns mesh dryer pipe heat recovery ventilation 4 inch ducting 4 inch extractor fan tumble dryer vent hose extractor fan bathroom air vent covers for walls chimney draught excluder insulated ducting 100mm external walls drafts soffit vents toilet covers cooker extra non return valve reducer simple seal tape hood 100mm non return valve bathroom ventilation fan inline extractor fan drain draught heater inline heat recovery ventilation system Review: Qualität bestens. In Dunstabzugsrohr verbaut und öffnet auch in geringster Stufe - Qualität ist absolut einwandfrei. Öffnet schon auf Stufe 1 meiner Abzugshaube. Ist zwar etwas kleiner als der Rohrinnendurchmesser, dafür passt es aber rein und kann ggf. mit Panzertape ausgeglichen werden. Ich bin damit sehr zufrieden. Review: Très bonne qualité - Facile à installer, fait le job, reste à voir sur la durée. ## Features - EXCELLENT QUALITY The neverest RK 4" ducting with backdraft shutter is very robust and durable. The housing is made of galvanized steel and the damper blades are made of aluminum. Two stainless steel springs are for automatic closing while the rubber ring ensures 100% closure and quiet closing. - PRODUCT FUNCTION The backflow damper blocks the cold and warm air from entering through the ventilation duct. The flaps open when the extractor fan blows out the exhaust air and automatically close as soon as the airflow stops. The flaps must be aligned horizontally in order to close optimally. - MULTIPLE USE This backdraft damper can also be used in whole-house ventilation, passive ventilation, air conditioning hose connector, vent connector, HVAC and Heat Recovery Systems. Fits all common round ventilation pipes and 100mm flexible ducting according to DIN EN 1506. - PERFECT CHOICE Designed for long-lasting ventilation systems perfect for home improvement. Can be used to join multiple lengths of pipe together to form a long duct run or connect directly to a ventilator. - NOTE This is to be installed in metal ducts only. Measure the diameter of your duct before purchasing. We are experts in ventilation for more than 40 years. If you have any questions or complaints, please contact our customer service directly. Your request will be processed immediately. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B011INHF5A | | Best Sellers Rank | #49,090 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #162 in Registers, Grilles & Vents | | Brand | neverest | | Brand Name | neverest | | Color | Silver | | Colour | Silver | | Connector Type | Pipe connector | | Connector type | Pipe connector | | Customer Reviews | 4.4 out of 5 stars 1,194 Reviews | | Exterior Finish | Galvanised steel | | Item Dimensions | 57 x 52 x 40 centimeters | | Item Weight | 140 Grams | | Item dimensions L x W x H | 57 x 52 x 40 centimeters | | Manufacturer | neverest | | Manufacturer Part Number | 40545030039031 | | Material | Steel , galvanized | | Material Type | Steel, galvanized | | Number of Pieces | 1 | | Size | 100mm | | Thread Size | 100 | | Thread Type | UN | | Unit Count | 1.0 Count | ## Product Details - **Brand:** neverest - **Colour:** Silver - **Item dimensions L x W x H:** 57 x 52 x 40 centimeters - **Material:** Steel, galvanized - **Size:** 100mm ## Images ![Neverest® RK Non-return Flap 100 mm Automatic Non-return Flap For Pipe Installation Pipe Connector Galvanized Steel with Sealing Rubber Aluminum Valves - Image 1](https://m.media-amazon.com/images/I/61R-zDPpQKL.jpg) ## Questions & Answers **Q: Hi, is the 5" made to go on to 5" duct** A: I purchsaed the 4 inch for my clothes dryer exhaust vent to the outside of my house. They are true to size and a 5 inch should fit a 5 inch duct perfectly. This is an excellent addition to either a stove vent or clothes dryer vent. It prevents back draft air from entering the duct and also prevents conditioned air from escaping my house. **Q: Hi - would it be best to put this at the end of the vent (near the outside) or on the house closest to the dryer? My vent is installed in the soffit.** A: Always at the end of the vent where the air exhaust to the outside of your house. You want to keep cold and hot air from being forced into your house on windy days as well as insect and birds from nesting. I have one on my kitchen stove vent on the outside brick wall and on my dryer vent on the side of my house. Before i installed it my laundry room was cold all winter from wibd being forced in. **Q: For my cooktop vent, i have a broken plastic damper i need to replace. this one is 5.5in od, what product would work for this?** A: I,m using a reducer on the top of the vent hood over the cook top from 5 inch vent to 4 inch duct and then i am using the 4 inch pressure activated back draft your referring to on the outside wall with an ordinary clothes dryer rain shield over the opening. The dryer vent pipe cover should have a wind / rain shield incorporated in it. Most dryer vent covers have a plastic door which does not permit a positive closer in windy conditions. I also have the spring loaded damper door on my clothes dryer. These doors are great for preventing blow back into your house when either the cooktop vent or dryer are not in use. **Q: Do u make a 7 inch inline damper?** A: Good Morning, the RK is available in 160mm or 200mm ## Customer Reviews ### ⭐⭐⭐⭐⭐ Qualität bestens. In Dunstabzugsrohr verbaut und öffnet auch in geringster Stufe *by J***H on 11 March 2021* Qualität ist absolut einwandfrei. Öffnet schon auf Stufe 1 meiner Abzugshaube. Ist zwar etwas kleiner als der Rohrinnendurchmesser, dafür passt es aber rein und kann ggf. mit Panzertape ausgeglichen werden. Ich bin damit sehr zufrieden. ### ⭐⭐⭐⭐⭐ Très bonne qualité *by D***L on 5 March 2026* Facile à installer, fait le job, reste à voir sur la durée. ### ⭐⭐⭐⭐⭐ A good purchase *by P***R on 26 January 2022* ## Frequently Bought Together - neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts - EesTeck 4" (Diameter) Adjustable 304 Stainless Steel Duct Clamps Hose Clamp Pipe Clamp Air Ducting Clamp worm drive hose clamps (4Pcs, 91mm-114mm) - QWORK 4" Duct Splitter, 45° Degree 4 Inch Branch Metal Duct Connector 3 Way Hose Adapter/Splitter --- ## 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/409695865-neverest-rk-non-return-flap-100-mm-automatic-non-return](https://www.desertcart.gr/products/409695865-neverest-rk-non-return-flap-100-mm-automatic-non-return) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-05-20*