Our Vinyl Curb Mount Fixed Acrylic Dome Skylights are designed for dependable daylight performance with added frame strength where it matters most. For units larger than 22 ¼" I.D., an aluminum stiffener is inserted inside the frame to help minimize flexing and improve overall stability. Each skylight is glazed using silicone for the pedestal gasket, creating a strong seal between the frame and glazing. The vinyl skylight line is also engineered to help reduce water and air infiltration to a minimum.