The Rheem Adjustable Roof Jack AP12118B-1 is designed for venting gas appliances safely and efficiently. This roof jack is adjustable from 15 to 32 inches, allowing for versatile installation on various roof pitches. Constructed from durable materials, it ensures long-lasting performance and compliance with industry standards. Ideal for use with Rheem water heaters, this roof jack facilitates proper venting, enhancing system efficiency and safety. Ensure your installation meets all necessary codes with this reliable and adjustable roof jack.