SpiroPure SP-PS-3921 is a compatible alternative pool and hot tub spa replacement for Watkins 78161 / 1642301-1, Filbur FC-3921, Unicel C-6350, and Pleatco PWK35B cartridges. SP-PS-3921 is designed to fit pools by Watkins Hot Spring Spas.
Important Specifications:
- Diameter: 6-3/8" (6.375")
- Length: 14"
- Top Hole: 2"
- Bottom Hole: 2"
- Top Style: Open
- Bottom Style: Open
- Media Area: 50 sqft
- Weight: 3 oz
Compatible Filter Model/Part Numbers:
- Darlly 67501
- Filbur FC-3921
- Pleatco PWK35B
- Pure N Clean PC-3921
- SD-01386
- Unicel C-6350
- Unicel C-6355
- Watkins Limelite 50
- Watkins 78161
- Watkins 1642301-1
- Watkins 78372
- 50 sq.ft. Hot Springs Spas/Watkins. Mfg.
Compatible Hot Tub Spa & Pool Brands:
