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Hayward CX550RE is an original replacement cartridge and is open w/molded gasket
can also use generic "after-market" filter UNICEL C-7455
Alternate part number as seen on cartridge top: C-550-E
Hayward original cartridge pool filter elements are made of a superior reinforced polyester material. They provide superior water clarity and their durability allow for longer filter cycles, which means fewer required cleanings and a longer life product. To maintain your swimming pool water clarity and cleanliness, use a Hayward genuine pool filter.
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Note: All prices in US Dollars