The Rheem AP21182 Filter is designed for 120 HPWH systems, measuring 10 inches in length. This high-efficiency filter captures contaminants, ensuring clean water output and optimal performance. Constructed from durable materials, it meets industry standards for filtration and safety. Easy to install, this filter is compatible with various Rheem models, making it an essential component for maintaining your water heater's efficiency. Regular replacement of this filter helps prolong the life of your system and improve water quality.