Oatey No-Caulk 4 In. Galvanized Base Pipe Flashing is designed for a leak-proof installation around vent stacks. It features exclusive one-piece construction to ensure a secure seal every time. The elastomeric collar allows the vent stack to expand and contract as needed. The galvanized base is made from durable 24-gauge metal, providing a lightweight and long-lasting flashing solution. Installation is straightforward: the flashing easily slips over the vent stack and automatically adjusts to the pipe size and roof angle, remaining ly flat on the roof. This product is an effective way to seal and protect vent pipes on roofs. Model Number: 11880