An efficient way to ensure a watertight installation for windows. Has been designed to integrate efficiently with specific roofing materials. The one-piece bottom apron design improves aesthetic finish and allows for easy installation. 10 Year Manufacturers Guarantee (Registration Required, T&Cs Apply) Watertight Easy to Install Roof Pitch: 15 to 90° Max. Material Profile: 10mm Specifically Designed for Keylite Roof Windows 10 Year Manufacturers Guarantee (Registration Required, T&Cs Apply) Watertight Easy to Install Roof Pitch: 15 to 90° Max. Material Profile: 10mm Specifically Designed for Keylite Roof Windows