Fits Sta-Rite Posi-Flo T-135TX
Top end is blue and open
Bottom end is orange and open w/12 concentric slots
Inside diameter at both ends is 4-3/16"
Unicel UHD-SR135 replaces Sta-Rite cartridge filter WC108-59S2X 4 oz. media
Note: Original Sta-Rite cartridge discontinued by Sta-Rite. Replacement fits stainless steel tank only.
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