Down East 80402 Filter Cartridge
Down East OEM number • 45 sq ft • 8.25″ OD × 6.875″ long
80402 is Down East's number for this cartridge, not a part you have to buy from Down East. The filter itself is a 45 square foot cartridge measuring 8.25 inches across and 6.875 inches long, and Pleatco, Unicel, and Filbur all build it. If you read 80402 off an old cartridge or found it in your manual, any of the numbers below drops into the same housing.
Fitment notes
The new-style Eco-Pur outer cartridge, open at both ends with 4-1/16 inch openings. Pleatco publishes it as 8-1/4 by 6-7/8 inches at 45 sq ft, which is where the 45 in the part number comes from. Unicel publishes its C-8341 as 8 by 6-3/4 inches at 40 sq ft and states that two cartridges are required in the 2006 and later systems, so order in pairs. Pleatco points both this and the PMA40-2003-R at that same C-8341 while publishing different dimensions for each, so match your old cartridge to the Pleatco figures rather than assuming the two are interchangeable.
What to buy instead
Replacements for the Down East 80402
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 |
|---|---|---|
| Down East | 80402 | The number you searched |
| Pleatco | PMA45-2004-R | Aftermarket equivalent |
| Unicel | C-8341 | Aftermarket equivalent |
| Filbur | FC-1007 | Aftermarket equivalent |
| Master Spas | X268330 | Other OEM number |
| Master Spas | X268552 | Other OEM number |
Full specs, the cartridge diagram, and the complete compatibility list live on the PMA45-2004-R cartridge page. You can also see every 8.25″ × 6.875″ cartridge if you are checking a measurement rather than a part number.
Equipment that uses this cartridge
Frequently Asked Questions
What filter replaces the Down East 80402?
The PMA45-2004-R replaces it directly, and so does every cross-reference for it: C-8341, FC-1007. All of them are the same 45 sq ft cartridge at 8.25" outer diameter and 6.875" long. Buy whichever is cheapest at the time with solid recent reviews. The same cartridge also shows up as Master Spas X268330, Master Spas X268552, so those are not different filters either.
Is the Down East 80402 the same as the PMA45-2004-R?
Yes, physically the same filter. Down East 80402 is an OEM number, meaning it is the code Down East put on the cartridge that shipped with the equipment. Down East 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 Down East 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 Down East 80402?
8.25 inches in outer diameter, 6.875 inches long, with 45 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 September 2026