The Rheem SP20915A 8 in. 2 Units Back to Back Power Vent Header Kit is designed for efficient venting of two units simultaneously. This kit is constructed from high-quality materials, ensuring durability and reliability in various applications. Its innovative design allows for easy installation and compliance with industry standards, making it a perfect choice for both residential and commercial setups. The power vent header kit enhances the performance of your water heating system by ensuring proper ventilation, which is crucial for safety and efficiency. Upgrade your system with this essential kit.