Selkirk RV 3" 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 roof flashing creates a weatherproof seal around the vent, preventing leaks and protecting your home or commercial building from water damage. It is suitable for roofs with pitches ranging from flat up to 6/12, making it versatile for various installation needs. The flashing features a 4" A dimension and a minimum 3-1/2" flange dimension (C), specifically engineered to work with Type B gas vent systems. The size refers to the inside diameter of the pipe or fitting, while the outside diameter of RV pipes is typically slightly larger. This product is designed to maintain the integrity of gas venting systems, providing peace of mind and long-lasting performance. Model Number: 103825