Selkirk RV 5" x 5-3/4" x 10-1/2" Gas Vent Collar is designed to enhance both the functionality and appearance of gas venting systems, especially those using Type B gas vents. This collar a polished and decorative finish to vent installations, ensuring a clean and professional look. Beyond aesthetics, it acts as a firestop, helping to prevent fire from spreading through openings in floors, ceilings, and walls where the gas vent passes. The collar measures 2-3/8" for the C dimension, with sizing based on the inside diameter of the pipe or fitting. Typically, the outside diameter of RV pipes is about 1/2" larger. This product improves both safety and visual appeal in your venting setup. Model Number: 105460