The Sight Glass (AP12617-3) from Rheem is a crucial component for monitoring water levels in your heating system. This high-quality sight glass is designed for durability and clarity, allowing for easy visibility of water levels. It is compatible with various Rheem water heater models, ensuring a perfect fit and reliable performance. Made from robust materials, this sight glass withstands high temperatures and pressures, making it suitable for both residential and commercial applications. Installation is straightforward, providing a quick solution for maintaining your water heating system.