In Europe, almost all campervans and motorhomes are equipped with double-pane RV windows – and for good reason. The GEARZAAR 500×450 mm Cassette Window offers exceptional insulation, convenience, and security – all in a sleek, modern design perfect for both retrofits and new builds. Premium Acrylic Double-Glazed Pane: Exceptional thermal and noise insulation. Integrated Roller Blind & Fly Screen: Adjust both simultaneously with one hand. Size: 500x450mm (Cut-Out Size). Multi-Lock Safety Catches: Prevents the window from being opened from outside. Thermal Insulation Coating: Blind features white-cream interior and aluminium-coated exterior for heat reflection. Insect-Resistant Fly Net: Black square lattice for maximum visibility and protection. Fits Wall Thicknesses: 25-55mm (adjustable by trimming inner frame). Easy DIY Installation: Ideal for Beginners & Pros, Simply screw the window frame from the inside to clamp to the vehicle wall; Apply polyurethane or semi-permanent sealant around the outer frame for a watertight seal; Attach the inner cassette frame for a seamless finish and added blind protection during install. Fitment for: Camper Van Conversions, Horseboxes, Motorhomes & Caravans, RV, Boat. 1 Outer Window Frame. 14 Exterior Window Mounting Screws. 4 Inner Window Mounting Screws. Note: Take care to measure your existing window precisely before ordering. Look for etched size markings on your old window or measure the aperture (cut-out size) directly.