15 sq.ft. Cartridge Filter Pleatco, Softsider, Vita Spas C-4303 FC-0185 Diameter…………………………………4-5/8" Length……………………………………6-3/4" Top End Cap: id/config……………../ molded cone handle Bottom End Cap: id/config…………1-9/10" / open Used on: Pleatco Softsider Spas Softsider Spas Vita Spas Note: Unicel replacement needs a 1-1/2” PVC pipe nipple/PAD adapter (not furnished).

50 sq. ft. Cartridge Filter Cal Spas, Martec, Sonfarrel C-4305 FC-1618 Diameter…………………………………4-15/16" Length……………………………………14-7/8" Top End Cap: id/config……………..2-1/8" / open Bottom End Cap: id/config…………2-1/8" / open The cartridge is used on the following spas: Advantage Mfg. Cal Spas Dolphin Martec, OEM P/N CL-2807 Pageant Spas Sonfarrel, OEM P/N 220142 Sundance Spas, OEM P/N 6540-497