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Replaces Unicel C-4950, Pleatco PRB50-IN, Filbur FC-2390
Fits & replaces
This Excel Filters cartridge (XLS-408) is a direct-fit replacement for Pentair Rainbow Dynamic 50 and Rainbow Pentair Rainbow Dynamic 50 filter systems, cross-referenced with Pleatco PRB50-IN, Unicel C-4950, and Filbur FC-2390. Confirm the part number on your current cartridge — or its diameter, length, and end caps — before ordering.
See the full compatibility list (35) →
Pleatco / Unicel / Filbur equivalents on the cross-reference chart →
Built to OEM dimensions for Pentair Rainbow Dynamic 50 and Rainbow Pentair Rainbow Dynamic 50 cartridge filter systems, this replacement matches the original cartridge geometry, end-cap style, and media surface area — without the OEM markup. It directly replaces aftermarket Pleatco PRB50-IN, Unicel C-4950, and Filbur FC-2390 part numbers — the full cross-reference list is in the Compatibility tab. Every cartridge is manufactured in our Austin, TX facility, ships free, and is backed by the Excel Filters Perfect Fit Guarantee on its listed cross-references.
The XLS-408 1PACK replacement cartridge is engineered for Pentair® and built for dependable day-to-day filtration performance. Each cartridge is sized at 4 15/16" diameter x 13 5/16" length, with Open End top and Open End bottom end caps for direct-fit installation with no housing modifications.
Measure your old cartridge cap-to-cap. A variance of ⅛" is normal — anything larger likely means a different housing model.
Match your filter housing below, click any part number to verify the fit, or paste your existing part number into the search box.
Filter housings and systems this cartridge fits
OEM and competitor cartridge part numbers this product replaces
Can't find your part number? Look it up on the full pool filter cartridge cross-reference chart.
Match the part number printed on your current cartridge against the Compatibility list on this page, or measure the outer diameter, length, and end-cap style and compare them with the Dimensions and Fit tab. A variance of about 1/8 inch is normal — anything larger usually means a different housing model.
It directly replaces R173434, 17-2380, 373045, 817-5000, 6540-471, H-4950, 100533, 3301-2145, PRB50-IN, PRB50-IN-M, C-4950, C-4950RA, FC-2390, FC-2390M, Aber 03FIL1600, Beachcomber 3005815, Caldera 302005, Caldera 73533, Caldera 76076, CMP 25391, CMP 25393, Orca Bay 5001, Aladdin 15002, Baleen AK-3049, Darlly 40506, Magnum RD50, Pure N Clean PC-2390, Spa-Daddy SD-00201, Spa-Daddy SD-00455, Rec Warehouse 303506. This covers the OEM, Pleatco, Unicel, and Filbur cross-references listed in the Compatibility section on this page.
It fits Pentair/Rainbow Dynamic Series I RDC-50 and RDC-50S, Pentair/Rainbow Dynamic Series II/III RTL-50 and RCF-50, Pentair/Rainbow Dynamic Series IV DFM and DFML (50 sq. ft.), Jacuzzi J-200 Series using cartridge 373045 and the other systems listed in the Compatibility tab when dimensions match. Always confirm against your housing model before ordering.
No — it is an aftermarket replacement cartridge manufactured by Excel Filters in Austin, TX and built to OEM dimensions and media specs. It is not affiliated with or endorsed by the original equipment manufacturer.
Most pool and spa cartridges last one to two seasons depending on bather load and water chemistry. Rinse the cartridge monthly during heavy use and replace it when cleaning no longer restores flow or the pleats show wear.
First double-check the part number on your old cartridge against the Compatibility list on this page — most fit problems trace back to ordering for a different housing model than the listing covers. If you still have a fit question, contact us at (888) 532-2801 and our team will help you confirm the right cartridge before or after you order; returns are handled under our standard return policy.
XLS-418 1Pack
In stockReplaces FC-2385, C-4335 and PRB35-IN
XLS-705 4Pack
In stockReplaces Jandy R0554600, Pleatco PJAN115, Unicel C-7468, Filbur FC-0810
XLS-718 4Pack
In stockReplaces R173576, PCC105, Unicel C-7471, Filbur FC-1977
XLS-722 4Pack
In stockReplaces CX875RE, CX880XRE, PA106, C-7488, FC-1226
