4 ALUMINUM FLASHING SKU: 463523 Oatey Exclusive one-piece construction insures a positive leakproof installation every time. Elastometric collar allows the vent stack plenty of room for expansion and contraction. Aluminum base is made from prime .032 metal a lightweight long-lasting flashing. Easy-to-install the flashing slips over the vent stack and automatically adjusts to pipe size and roof angle. Remains perfectly flat on roof. Item Attributes Size: 4 In. Material: Aluminum Color: Mill & Black Base Dimensions: 12 In. x 15 In. Roof Pitch: 40 Degree