Boomerangg Connector with Backdraught Shutter 100mm 4 inch Non Return Damper Flap to Connect Duct Pipe or Flexible Ducting Hose

plastic ducting connector with inline backdraught shutter / gravity damper flap 100mm - 4" Will fit inside 100mm round pipe or 102mm flexible hose and can be used to join multiple lengths of pipe together to form a long duct run. Perfectly suited for ducting your Tumble Dryer, Bathroom or Kitchen extractor fan, Hydroponics, In-Line Extract Fans, or Cooker Hood and other ventilation applications. Stop smells and prevent cold air coming through your extract fan or ducting. Equipped with a back draft damper for back flow prevention, Easy to Fit., Manufacturer: Boomerangg