Specialty Recreation (SL1414S Smoke 14" x 14" Skylight Dome Bri-Rus Skylight Dome Skylights are made of high performance thermoformed polycarbonate to be long lasting and easy to clean When choosing a Skylight, measure your rough hole opening as well as the overall exterior size; Positive-seal weather-stripping is leak-resistant and water tight There is a size to replace most manufacturer's original equipment, Square Skylight, Smoke color, Hole size 14 inch x 14 inch; flange size 18.5 inch x 18.5 inch; height 4 inch Skylights sit directly on your RV roof, No metal flange is used with these single pane skylights Use a skylight size that is equal to or greater than your hole dimensions