Hayward Star Clear Swimming Pool Filter Head Gasket CX250F | eBay
Amazon.com : Unicel C7656 Hayward Hot Tub and Spa 7 Inch Filter Pump 50 Square Foot Replacement Cartridge for C500 and CX500-RE Model Hot Tubs : Swimming Pool Cartridge Filter Inserts :
Tier1 175 sq. ft. Pool and Spa Filter Cartridge for Hayward CX1750RE, C1900RE, C8417, Filbur FC-1294, Pleatco PA175 TIER1-PAS-1044 - The Home Depot