The Indoor Manifold Assembly Kit with Gas Proportional Valve is designed for natural gas applications, specifically for Rheem tankless water heaters. This kit includes a high-quality gas proportional valve that ensures precise gas flow control, enhancing efficiency and performance. Constructed from durable materials, it meets industry standards for safety and reliability. The assembly dimensions are optimized for easy installation, making it compatible with various Rheem models. Ideal for residential and commercial use, this manifold assembly is essential for maintaining optimal water heating performance.