Darlly 70551 Pool Filter Cartridge
Replaces Unicel C-7455 (now C-7656, 50 sq ft) · Pleatco PA55 (now ULTRA-A11) · Filbur FC-1245
- Diameter × length
- 7" × 19-5/8"
- Filter area
- 55 sq ft
- End caps
- 3" Open w/ molded gasket / 3" Open w/ molded gasket
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 70551 is a 55 sq ft pool filter cartridge, 7" x 19-5/8". It replaces Unicel C-7455 (now C-7656, 50 sq ft), Pleatco PA55 (now ULTRA-A11) and Filbur FC-1245.
Specifications
| Darlly part number | 70551 |
|---|---|
| Outside diameter | 7" |
| Length | 19-5/8" |
| Top end cap | 3" Open w/ molded gasket |
| Bottom end cap | 3" Open w/ molded gasket |
| Filter area | 55 sq ft |
| Type | Pool |
| Darlly description | Hayward CX550RE, Muskin P/N 58039, FE-127 |
Cross-reference
| Brand | Part numbers Darlly 70551 replaces |
|---|---|
| Unicel | C-7455 (now C-7656, 50 sq ft) |
| Pleatco | PA55 (now ULTRA-A11), ULTRA-A11 |
| Filbur | FC-1245 |
Unicel replaced C-7455 with C-7656, a 50 sq ft cartridge. Darlly's match for C-7656 is 70508, the same size and end caps as 70551.
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-7455?
- Darlly 70551 replaces Unicel C-7455, which Unicel replaced with C-7656, a 50 sq ft cartridge. Both are 7" in diameter and about 19-5/8" long.
- What Darlly cartridge replaces Pleatco PA55?
- Darlly 70551 replaces Pleatco PA55, which Pleatco now sells as ULTRA-A11.
- What size is Darlly 70551?
- Darlly 70551 is 7" in outside diameter and 19-5/8" long, with 55 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.