Upgrade your VELUX roof window with the DBL Replacement Blackout Blind for C02. This blind offers near-total darkness and smooth manual operation. No tape measure is required to find the correct size; simply locate the window code reference at the top of your open VELUX roof window. Compatible with VELUX roof windows with reference codes: GGL C02, GGU C02. This is an inexpensive option from VELUX, ideal for replacing old and worn blinds. It features manually operated stepless positioning for an almost complete blackout effect. The blind is easy to install, tailored for VELUX roof windows for a perfect fit, and can be installed in minutes with the pre-fitted mounting system. If mounting brackets are not pre-fitted, you will need to purchase the Z0Z 230 separately.