Fits Sundance spas 125 sq. ft. replacement cartridge - Universal Length
Top end cap is closed with 3 step edge
Bottom end cap is open w/beveled edge 2-1/2" inside diameter
Note: Length recorded is measured to first step. Replacement for 18" to 18-1/2" overall length
Unicel C-8325 replaces the following cartridge filters:
Sundance Spas filter 6540-490 (6540490)
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