The Beddoes Products Pipe Adaptor has a diameter of 110mm.
Sometimes your existing 100mm flexible pipe won't quite fit our pipe adaptor.
The duct reducer solves this problem by reducing the diameter from 110mm to 100mm so your flexible pipe can connect to the vent tile easily.
It's small, lightweight and only costs £5 to add-on to your order - A small addition that will save you the cost and hassle of finding out you need one later.
Note: You only need a duct reducer if you added a 'vent + pipe adaptor' package to your basket and your existing flexible pipe is 100mm.