Selkirk RV 3" x 18" Round Gas Vent Pipe is a versatile component designed for Type B gas venting systems, ing a reliable and efficient solution for venting gas appliances safely. This vent pipe is easy to assemble, allowing you to customize the venting height to fit your specific 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 of the pipe is 1-1/2 inches less than the listed length, which is important to consider during installation planning. With its durable construction and precise design, this gas vent pipe is an excellent choice for creating a safe venting system. Model Number: 103018