Darlly 40204 Pool Filter Cartridge
Replaces Unicel C-4620 (now C-4320)
Darlly 40204 is a 20 sq ft pool filter cartridge, 4-5/8" x 11-7/8". It replaces Unicel C-4620 (now C-4320).
Specifications
| Darlly part number | 40204 |
|---|---|
| Outside diameter | 4-5/8" |
| Length | 11-7/8" |
| Top end cap | 2-1/16" Open |
| Bottom end cap | 2-1/16" Open |
| Filter area | 20 sq ft |
| Type | Pool |
| Darlly description | American Commander II (in-line) |
Cross-reference
| Brand | Part numbers Darlly 40204 replaces |
|---|---|
| Unicel | C-4620 (now C-4320) |
Older or other numbers that also point to this cartridge (not confirmed by a second source): PA20 (Pleatco), FC-0645 (Filbur).
Other Darlly cartridges the same size
Same diameter and length. Check the end caps and area before swapping.
Questions
- What is the Darlly replacement for Unicel C-4620?
- Darlly 40204 replaces Unicel C-4620, which Unicel now sells as C-4320. Both are 4-5/8" in diameter and about 11-7/8" long.
- What size is Darlly 40204?
- Darlly 40204 is 4-5/8" in outside diameter and 11-7/8" long, with 20 sq ft of filter area.
Cross-reference checked October 21, 2026 against Unicel's 2026 Replacement Guide, Pleatco's catalog (updated September 2025), filbur.com and darllyfilter.com. A competitor number is listed only when that brand's own data pairs it with the same cartridge size. Always compare the size and end caps of your old cartridge before ordering.
Brand names and part numbers are trademarks of their respective owners and are shown only to identify compatible replacements. Darlly Filtration is not affiliated with or endorsed by them. Cross-reference by The Grit Game, Darlly's sales agency.