1. NSF/ANSI 50 CERTIFIED Pool and Spa filter is tested and certified by IAPMO against NSF/ANSI 50. The filter with certified materials provides clean, fresh and clear water. Select certified filters for your family to ensure the , and happiness of your loved ones. 2. SPECIFICATIONSLength: 28 3/16'; Outside Diameter: 8 15/16'; Top Bottom Opening: 4'; Filtration Area: 175 Sq.ft; Filter Material: Trilobal Filtration Fabric. 3. REPLACEMENT MODELS TRF8417 filter compatible Hayward Star Clear Plus C1750/C17502/C17502S, PA175M, Unicel C8417RA, Filbur FC1294M, AK7011, SD00106. NOTE: This is a compatible spare part and the manufacturers' names and part numbers have been used for reference purposes only. It is an independent brand. 4. REINFORCEMENT STRUCTUREWith 25% thicker filtration fabric, heavy chlorine resistant and breakresistant end caps and reinforced center support, the filter delivers high powered propulsion flow, and crystal clear water, providing a relaxed and y enjoyment. 5. MORE EFFICIENT FILTRATION AREAUniformity and highperformance trilobal fabric has 2140% higher capacity compared with common pointbond fabric. The trilobal shape of fabric fibers also helps catch particles, increases efficiency without the pressure drop penalty, and helps reduce filter cleaning frequency.