This is a generic model that looks exactly the same, the color may be different but the functionality is exactly the same! Part Number: CX900F, U9-228, U9-228A Compatible with: Hayward Separation Tank Filter Housing Compatible with: Hayward Star-Clear Plus Cartridge Filter Models C751 C900 C1200 C1750 Compatible with Sta-Rite U9-228A O-240 one per pack O-Ring It is best to replace O-RING every 3-4 months, depending on the use environment, temperature, water quality pH influence. Maintain pump and filter performance and don't wait for water leakage before doing measures O-Ring Is Made of Rubber, Replace the Sealing Ring Regularly, the Filter Can Be Sealed For a Long Time and Work Better CX900F Filter Head O-Ring Replacement for Hayward Star-Clear Plus Cartridge and Separation Tank C751 C900 C1200 C1750 Filter (1 Pack)