Darlly 41002 Spa Filter Cartridge
Replaces Unicel C-4999 · Pleatco PRB100 (discontinued) · Filbur FC-2397
- Diameter × length
- 4-15/16" × 26-11/16"
- Filter area
- 100 sq ft
- End caps
- 2-1/8" Open / 2-1/8" Open
- Per filter
- 1 cartridge
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 41002 is a 100 sq ft spa filter cartridge, 4-15/16" x 26-11/16". It fits the Rainbow / Pentair RTL-100 / Dynamic 100. It replaces Unicel C-4999, Pleatco PRB100 (discontinued), Filbur FC-2397, Pentair R173436 and Pentair / Rainbow 17-2633.
Specifications
| Darlly part number | 41002 |
|---|---|
| Outside diameter | 4-15/16" |
| Length | 26-11/16" |
| Top end cap | 2-1/8" Open |
| Bottom end cap | 2-1/8" Open |
| Filter area | 100 sq ft |
| Type | Spa |
| Blue antimicrobial version | 41002M |
| Darlly description | Rainbow RTL-100 |
Cross-reference
| Brand | Part numbers Darlly 41002 replaces |
|---|---|
| Unicel | C-4999 |
| Pleatco | PRB100 (discontinued) |
| Filbur | FC-2397 |
| Hurricane (former brand) | HF4999-01 |
| OEM and other numbers | Pentair R173436, Pentair / Rainbow 17-2633 |
Filters it fits
| Filter | Cartridges per filter | OEM cartridge number |
|---|---|---|
| Rainbow / Pentair RTL-100 / Dynamic 100 (100 sq ft filter) | 1 | R173436, 17-2633 |
Questions
- What is the Darlly replacement for Unicel C-4999?
- Darlly 41002 replaces Unicel C-4999. Both are 4-15/16" in diameter and about 26-11/16" long.
- What Darlly cartridge replaces Pleatco PRB100?
- Darlly 41002 replaces Pleatco PRB100.
- What size is Darlly 41002?
- Darlly 41002 is 4-15/16" in outside diameter and 26-11/16" long, with 100 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.