Darlly 40508U Spa Filter Cartridge
Replaces Unicel 4CH-949 · Pleatco PWW50L · Filbur FC-0172
- Diameter × length
- 4-15/16" × 13-1/2"
- Filter area
- 50 sq ft
- End caps
- v-groove semi-circular handle / 2" female SAE thread
- 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 40508U is a 50 sq ft spa filter cartridge, 4-15/16" x 13-1/2". It fits the Waterway Teleweir 50. It replaces Unicel 4CH-949, Pleatco PWW50L, Filbur FC-0172 and Waterway 817-4050.
Specifications
| Darlly part number | 40508U |
|---|---|
| Outside diameter | 4-15/16" |
| Length | 13-1/2" |
| Top end cap | v-groove semi-circular handle |
| Bottom end cap | 2" female SAE thread |
| Filter area | 50 sq ft |
| Type | Spa |
| Darlly description | Rising Dragon |
Cross-reference
| Brand | Part numbers Darlly 40508U replaces |
|---|---|
| Unicel | 4CH-949 |
| Pleatco | PWW50L |
| Filbur | FC-0172 |
| Hurricane (former brand) | HF4H949-01 |
| OEM and other numbers | Waterway 817-4050 |
Filters it fits
| Filter | Cartridges per filter | OEM cartridge number |
|---|---|---|
| Waterway Teleweir 50 (50 sq ft filter) | 1 | 817-4050 |
Fits a 1-1/2" male SAE standpipe.
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 4CH-949?
- Darlly 40508U replaces Unicel 4CH-949. Both are 4-15/16" in diameter and about 13-1/2" long.
- What Darlly cartridge replaces Pleatco PWW50L?
- Darlly 40508U replaces Pleatco PWW50L.
- What size is Darlly 40508U?
- Darlly 40508U is 4-15/16" in outside diameter and 13-1/2" long, with 50 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.