Selkirk RV 4" x 5' Round Gas Vent Pipe is a versatile component designed specifically for Type B gas venting systems. This gas vent pipe is easy to assemble, allowing you to create the necessary venting height tailored to your installation needs. When connecting multiple sections, the couplers overlap by 1-1/2 inches to ensure a secure and airtight fit. Keep in mind that the assembled length is 1-1/2 inches less than the listed length, so plan accordingly. The size designation refers to the inside diameter of the pipe, while the outside diameter is approximately 1/2 inch larger. This product a reliable and efficient solution for safely venting gas appliances. Model Number: 104060