Selkirk RV 3" x 5' Round Gas Vent Pipe is a versatile and reliable component designed for Type B gas venting systems. This vent pipe is easy to assemble, allowing you to create the precise venting height needed for your installation. 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 of the pipe is 1-1/2 inches shorter than the listed length, which is important to consider during planning. The 3-inch size refers to the inside diameter of the pipe, while the outside diameter is approximately 1/2 inch larger. This product is an excellent choice for safely and efficiently venting gas appliances. Model Number: 103060