Do this product have a spring to close the back shutter? Or does is use gravity to close it once the flow stops?

Gravity - it does rattle in the wind

Can this be fitted on a 45 deg slop downwards to the outside vent and will it still work fully? Thanks

Oh not so sure it will stay closed at that angle. I have mine fitted on a flat surface and it works perfect.

Is this product suitable for extracting cooking fumes and steam?

Hi I have used this item to prevent a back draught in ducting for an online bathroom steam extraction system.

On an in-line fan. where is the best place to put one of these? before the fan or after? and does it go onto the fan spigots? or the end of the ducts?

It goes after the fan in the exhaust direction to prevent draughts returning through the vent back into the room/device being vented. It is designed to fit in line in the pipework and will need glueing into rigid pipework or securing with a large pair of jubilee clips into flexible pipes whether plastic or aluminium. You should find on a reasonable external vent kit that it also contains a non return flap, however if you're hooking up multiple rooms in series (i.e. on a single pipe), these also reduce the amount of noise which leaks through the vents

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Ducting Pipe Non Return Valve 100mm Round Duct Rigid Tube Connector with Shutter Extractor Fan Backdraft Damper Stopper KO100-22

Ducting Pipe Non Return Valve 100mm Round Duct Rigid Tube Connector with Shutter Extractor Fan Backdraft Damper Stopper KO100-22

Product ID: 51173976

Details

Brand
MKK
Colour
White
Connector type
Plug
Exterior finish
Glatte
Item dimensions L x W x H
10 x 10 x 6
Material
Polyvinyl

♻️Durable PVC plastic

⚙️100mm precision fit

🛡️Backflow flap for air protection

VT3256

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Description

🛠️ Connect with confidence — the silent guardian of your airflow!

RUST FREE RELIABILITY - Springless gravity flap mechanism eliminates rust risk, guaranteeing long-lasting performance.
VERSATILE INSTALLATION - Ideal for both rigid and flexible duct pipes, adaptable with simple duct tape for a silent, secure fit.
SMART BACKFLOW FLAP DESIGN - Prevents cold air intrusion and unwanted drafts, perfect for exterior wall installations.
TRUSTED QUALITY WARRANTY - Backed by a 2-year manufacturer guarantee and praised by thousands of users for dependable use.
SEAMLESS 100 MM PIPE INTEGRATION - Engineered for a snug fit with standard 100mm round pipes, ensuring leak-free connections.

The MKK Ko100-22 is a high-quality white PVC plastic pipe connector designed for 100mm round pipes. Featuring a smart backflow flap, it prevents cold air from entering and ensures efficient airflow control. Its springless gravity flap design offers rust-free durability, making it ideal for both indoor and outdoor ventilation systems. With a 2-year warranty and strong user approval, it’s a reliable choice for professional-grade HVAC and ductwork solutions.

Specifications

ASIN	B00FCE0RSE
Best Sellers Rank	44,940 in Garden ( See Top 100 in Garden ) 1,231 in Garden Hose Parts & Connectors
Brand	MKK
Colour	White
Connector Type	Plug
Country of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (3,577)
Exterior Finish	Glatte Kunststoffoberfläche
Included Components	No
Item Dimensions	10 x 10 x 6 centimetres
Item Type Name	Building material
Manufacturer	Armar Trading LTD
Manufacturer Warranty Description	2 year manufacturer guarantee.
Material	Polyvinyl Chloride
Model Number	KO100-22
Number of Packs	1
Number of Pieces	1
Part Number	A289a_SML
Set Name	Small White
Size	Klein
Thread Size	M100
Thread Type	UN
Unit Count	1 unité

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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VT3256

Duties & taxes included

In stock

Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Customer service was outstanding when I had questions about the product.

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