---
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: "NZ$72"
currency: NZD
in_stock: true
category: "Neverest"
url: https://www.desertcart.nz/products/409695865-neverest-rk-non-return-flap-100-mm-automatic-non-return
store_origin: NZ
region: New Zealand
---

# 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:** NZ$72
**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?** NZ$72 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/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

## Features

- Neverest RK backflow flap 100 mm Automatic backflow flap For pipe installation Pipe connector Galvanized steel with sealing rubber Aluminum flap
- Perfect choice for hobby craftsmen and professionals. The lightweight flaps can also be opened by small fans.
- FUNCTION: Hose connector with backflow flap prevents the return of the exhaust air or the inflow of cold outside air. The flaps open when the fan blows the exhaust air outwards and closes automatically as soon as the airflow stops. The flaps must be aligned horizontally to close optimally.
- Versatile in all supply air and exhaust systems, such as air conditioners, dryers, cooker hood and ventilation systems.
- We are subject matter experts and there for you. 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 | #63,754 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #193 in Registers, Grilles & Vents |
| Brand Name | neverest |
| Color | Silver |
| Connector Type | Pipe connector |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,200) |
| Exterior Finish | Galvanised steel |
| Item Dimensions | 57 x 52 x 40 centimeters |
| Item Weight | 140 Grams |
| Manufacturer | neverest |
| Manufacturer Part Number | 40545030039031 |
| 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)
![Neverest® RK Non-return Flap 100 mm Automatic Non-return Flap For Pipe Installation Pipe Connector Galvanized Steel with Sealing Rubber Aluminum Valves - Image 2](https://m.media-amazon.com/images/I/71OoEpfjNSL.jpg)
![Neverest® RK Non-return Flap 100 mm Automatic Non-return Flap For Pipe Installation Pipe Connector Galvanized Steel with Sealing Rubber Aluminum Valves - Image 3](https://m.media-amazon.com/images/I/71U7XuBmmOL.jpg)
![Neverest® RK Non-return Flap 100 mm Automatic Non-return Flap For Pipe Installation Pipe Connector Galvanized Steel with Sealing Rubber Aluminum Valves - Image 4](https://m.media-amazon.com/images/I/71WA4lhgp7L.jpg)
![Neverest® RK Non-return Flap 100 mm Automatic Non-return Flap For Pipe Installation Pipe Connector Galvanized Steel with Sealing Rubber Aluminum Valves - Image 5](https://m.media-amazon.com/images/I/81dpOxjdMmL.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

## Frequently Bought Together

- neverest® RK 4" Professional Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts
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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-06-02*