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