Selkirk RV 5" 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 flashing creates a reliable weatherproof seal around the vent, preventing leaks and protecting your home or commercial property from potential water damage. It is compatible with roofs having pitches from flat up to 6/12, making it versatile for various roofing styles. The flashing features a 4" A dimension and a minimum flange dimension of 3-1/2" (C), specifically designed to work with Type B gas vent systems. The size refers to the inside diameter of the pipe or fitting, with the outside diameter of RV pipes typically being slightly larger. This adjustable roof flashing is crucial for maintaining the integrity and safety of gas venting installations in both residential and commercial environments. Model Number: 105825