The Rheem SP20915D 8 in. 5 Units Back to Back Power Vent Header Kit is designed for efficient venting in multi-unit water heating systems. This kit includes all necessary components for installation, ensuring optimal performance and compliance with safety standards. Constructed from high-quality materials, it is built to withstand various environmental conditions. The header kit is compatible with specific Rheem models, making it a versatile choice for both residential and commercial applications. Enhance the efficiency of your water heating system with this essential venting solution.