Pentair 17-0051 Filter Cartridge
Pentair OEM number • 14.5 sq ft • 2.875″ OD × 17.0625″ long
17-0051 is Pentair's number for this cartridge, not a part you have to buy from Pentair. The filter itself is a 14.5 square foot cartridge measuring 2.875 inches across and 17.0625 inches long, and Pleatco, Unicel, and Filbur all build it. If you read 17-0051 off an old cartridge or found it in your manual, any of the numbers below drops into the same housing.
Fitment notes
1-1/16 inch open top and bottom. Replacement for the Pentair Rainbow Hi-Flow 14.5 skim filter.
What to buy instead
Replacements for the Pentair 17-0051
Each button searches Amazon for one of the numbers this cartridge is sold under. The OEM version is usually the most expensive of the set and the aftermarket versions are the same physical filter, so it is worth checking all of them before you order.
Every number for this filter
| Brand | Part Number | Type |
|---|---|---|
| Pentair | 17-0051 | The number you searched |
| Pleatco | PRB14.5 | Aftermarket equivalent |
| Unicel | C-2302 | Aftermarket equivalent |
| Filbur | FC-2320 | Aftermarket equivalent |
Full specs, the cartridge diagram, and the complete compatibility list live on the PRB14.5 cartridge page. You can also see every 2.875″ × 17.0625″ cartridge if you are checking a measurement rather than a part number.
Frequently Asked Questions
What filter replaces the Pentair 17-0051?
The PRB14.5 replaces it directly, and so does every cross-reference for it: C-2302, FC-2320. All of them are the same 14.5 sq ft cartridge at 2.875" outer diameter and 17.0625" long. Buy whichever is cheapest at the time with solid recent reviews.
Is the Pentair 17-0051 the same as the PRB14.5?
Yes, physically the same filter. Pentair 17-0051 is an OEM number, meaning it is the code Pentair put on the cartridge that shipped with the equipment. Pentair does not manufacture cartridges. Pleatco, Unicel, and Filbur do, and they sell the identical part under their own numbers at a lower price. Match the dimensions against your old cartridge before ordering and you are covered.
Do I have to buy the Pentair version?
No. Nothing about the housing requires an OEM-branded cartridge, and the warranty on your equipment is not voided by using an aftermarket filter that meets the same spec. The reason to buy OEM is convenience, not performance. The reason not to is price, which is often a meaningful gap for an identical part. What matters is that outer diameter, length, and end-cap style all match.
What size is the Pentair 17-0051?
2.875 inches in outer diameter, 17.0625 inches long, with 14.5 square feet of filter media. Both measurements need to land within about an eighth of an inch, and the end caps have to match so the cartridge seats correctly when you close the lid. Measure your old one rather than trusting a number that has worn off the label.
Last verified August 2026