The Rheem SP20912C Direct Vent Header Kit is a 6-inch assembly designed for back-to-back installations of four units. This kit facilitates efficient venting for gas appliances, ensuring optimal airflow and compliance with safety standards. Made from high-quality materials, it is built to withstand various environmental conditions. The kit includes all necessary components for a straightforward installation, making it ideal for both residential and commercial applications. Enhance your system's performance with this reliable venting solution.