Selkirk RV 6" x 6-3/4" x 11-1/2" Gas Vent Collar serves both functional and aesthetic purposes within a gas venting system, especially one that uses Type B gas vents. This collar provides a clean and finished appearance to the vent installation, ensuring it looks neat and well-crafted. Beyond its decorative role, it also acts as a firestop, helping to prevent the spread of fire through openings in floors, ceilings, and walls where the gas vent passes through. The collar is designed with a specific dimension, featuring a C measurement of 2-3/8". The sizing refers to the inside diameter of the pipe or fitting, while the outside diameter of RV pipes is typically about 1/2" larger. Overall, this gas vent collar enhances both the safety and visual appeal of your venting system. Model Number: 106460