The Unicel C-4309 filter cartridge has the 1-3/4 inch holes on the top and bottom with only 10 Sq.Ft of filter media.
Filter details:
- Unicel P/N: C-4309
- Diameter: 4-3/4"
- Length: 8"
- Top: 1-3/4" Open
- Bottom: 1-3/4" Open
- Media: 10 sq.ft.
- Filter Media: 3oz Reemay
- Pleat count: 86
Compatible replacement for:
- F-110
- Pleatco PGF10
- Filbur FC-3743