This VELUX Vapour Barrier Collar (BBX 0000) is the perfect solution for your roof window installation needs. The collar is designed to prevent condensation and ensure that your roof windows are quick and easy to instal. Additionally, the collar is 100% vapour- and air-tight, providing you with a comfortable and secure home.The VELUX brand is known for its quality products, and this collar is no exception. It comes with a 10-year manufacturer warranty, giving you peace of mind with your purchase. The collar is sized for the FK06 window, and is ideal for use in skylight and roof window installations. Don't miss out on this opportunity to improve your home's comfort and security.