Darlly 40025 Pool Filter Cartridge
Replaces Unicel C-4313 · Pleatco PBW4PAIR (discontinued) · Filbur FC-3753
- Diameter × length
- 4-1/4" × 3-3/4"
- Filter area
- 2.5 sq ft
- End caps
- 2-1/16" Open / 2-1/16" Open
Pool and spa businesses in Florida, Georgia, South Carolina, Alabama, Mississippi, Louisiana and Texas order through their Grit Game rep. Everywhere else, contact Darlly Filtration directly.
Darlly 40025 is a 2.5 sq ft pool filter cartridge, 4-1/4" x 3-3/4", sold as a 2-pack. It fits the Intex Sand-n-Sun size D and Aqua Leisure size 1 (twin pack). It replaces Unicel C-4313, Pleatco PBW4PAIR (discontinued) and Filbur FC-3753.
Specifications
| Darlly part number | 40025 (also 40025-2PK) |
|---|---|
| Outside diameter | 4-1/4" |
| Length | 3-3/4" |
| Top end cap | 2-1/16" Open |
| Bottom end cap | 2-1/16" Open |
| Filter area | 2.5 sq ft |
| Type | Pool |
| Darlly description | Aqua Leisure Size"1", Intex Sand-n-Sun Size"D" |
Cross-reference
| Brand | Part numbers Darlly 40025 replaces |
|---|---|
| Unicel | C-4313 |
| Pleatco | PBW4PAIR (discontinued) |
| Filbur | FC-3753 |
| Hurricane (former brand) | HF4313-02 |
Filters it fits
| Filter | Cartridges per filter |
|---|---|
| Intex Sand-n-Sun size D; Aqua Leisure size 1 (twin pack) | not listed |
Sold as a 2-pack.
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-4313?
- Darlly 40025 replaces Unicel C-4313. Both are 4-1/4" in diameter and about 3-3/4" long.
- What Darlly cartridge replaces Pleatco PBW4PAIR?
- Darlly 40025 replaces Pleatco PBW4PAIR.
- What size is Darlly 40025?
- Darlly 40025 is 4-1/4" in outside diameter and 3-3/4" long, with 2.5 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.