Velux GGU Roof Windows are a smart addition to any home. The Velux GPU Roof Window comes white polyurethane moulding which has no visible joints Designed for in-reach applications requiring egress emergency escape abilities. The Velux GPU Roof Window is designed for simple, weather-tight installations. Velux GPU Roof Windows are available in a wide range of sizes. Backed by Velux's 10 year No Leak Guarantee (when installed with ECL or ECW flashing kit). A complete line of Velux Flashing Systems help ensure a weathertight installation for your GPU roof window on most types of roofs: shingles/shakes and high profile roofing.