The 6 in. 2 Units Back to Back Direct Vent Header Kit (Rheem SP20912A) is designed for efficient venting in Rheem heating systems. This kit includes all necessary components for installation, ensuring a seamless setup for two units. Constructed from durable materials, it withstands high temperatures and environmental conditions. The 6-inch diameter fits standard venting requirements, making it compatible with various Rheem models. Meeting industry standards, this header kit is essential for HVAC professionals aiming for optimal system performance.