Selkirk RV 4" Gas Vent Adjustable Roof Flashing is an essential component designed to ensure the safe and efficient operation of gas venting systems where the vent pipe passes through a roof. This adjustable flashing provides a reliable weatherproof seal, preventing leaks and protecting your home or building from water damage. It is compatible with roofs that have pitches from flat up to 6/12, making it versatile for various roofing types. The flashing features a 4" A dimension and a minimum 3-1/2" flange dimension (C), specifically designed to fit Type B gas vent systems. The size refers to the inside diameter of the pipe or fitting, while RV pipes typically have a slightly larger outside diameter. This product is i for maintaining the integrity of gas venting systems in both residential and commercial applications, ensuring long-lasting performance and safety. Model Number: 104825