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1-Pack Excel Filters XLS-408 replacement filter cartridge for Pentair Rainbow Dynamic 50
1-Pack Excel Filters XLS-408 replacement filter cartridge for Pentair Rainbow Dynamic 50 — view 2
1-Pack Excel Filters XLS-408 replacement filter cartridge for Pentair Rainbow Dynamic 50 — view 3
Cutaway diagram of an Excel Filters cartridge labelling its Cleanguard ultra-efficient media, optimal-flow engineered core, secure fit banding and durable end caps
Six-step illustrated guide to cleaning a pool filter cartridge: switch off the pump and release pressure, remove the cartridge, rinse it with a garden hose, flip it over and repeat, refit it in the housing, then enjoy the pool
A child floating with a kickboard in a clean swimming pool, above the line "Excel Filters replacement cartridges clean your pool and spa"
A golden retriever swimming underwater in a clear blue pool, above the line "Cleaner, clearer water. That’s how we Excel."
1-Pack 01 / 07
Pentair® CompatiblePool and Spa Filter

Excel Filters XLS-408 Replacement Filter Cartridge for Pentair Rainbow Dynamic 50 — 1-Pack

Compatible Replacement for Pentair R173434. Cross-References Pleatco PRB50-IN, Unicel C-4950 and Filbur FC-2390.

Made in the USA by Excel Filters

SKU XLS-408 1PACK · UPC 810625020136

$32.99 Single Cartridge
Free shipping. Tax calculated at checkout.
In stock 7 cartridges ready to ship from Austin

30-day returns.

  • Perfect Fit Guarantee*On listed part numbers
  • Free Standard Shipping*Every order, no minimum.
  • 6-Month Warranty*Covers manufacturing defects

Confirm your fit

  • Your housing — 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.).
  • Your old part number — R173434, 17-2380, 373045, 817-5000, 6540-471. See all 35 compatible parts →
  • Your measurement — 4 15/16" diameter, 13 5/16" height, Open End caps top and bottom.

Overview

Built to OEM Spec, Engineered to Clean®

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 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.

Specifications

Measure once. Order with confidence.

Measure your old cartridge cap to cap, then across the widest pleat.

How to measure a cartridge →
Outer diameter
4 15/16"
Overall length
13 5/16"
Top end cap
Open End
Bottom end cap
Open End
Media per cartridge
50 ft²
Total media
50 ft²

Measuring your old cartridge

  • Length — cap to cap, with both end caps included.
  • Diameter — across the widest point of the pleats, not the end cap.
  • End caps — whether each end is open or closed, and the size of any opening.

A variance of ⅛" is normal. Anything larger usually means a different housing model — check the number printed on your old cartridge against the compatible parts list before ordering.

Cross-reference

Check compatibility by system or part number

Match your filter housing below, click any part number to verify the fit, or paste your existing part number into the search box.

Fits These Systems

Filter housings and systems this cartridge fits

Pentair® Housings
Pentair/Rainbow Dynamic Series I RDC-50 and RDC-50SPentair/Rainbow Dynamic Series II/III RTL-50 and RCF-50Pentair/Rainbow Dynamic Series IV DFM and DFML (50 sq. ft.)
Jacuzzi® Housings
Jacuzzi J-200 Series using cartridge 373045
Waterway™ Housings
Waterway TWM / top-load in-line 50 sq. ft. housing

Replaces These Part Numbers

OEM and competitor cartridge part numbers this product replaces

Pentair®
Jacuzzi®
Waterway™
Sundance®
Harmsco®
Coleco®
Pleatco
Unicel
Filbur
Other Part #s This Replaces

The Perfect Fit Guarantee applies to the cross-references listed here. Brand names, models and part numbers identify compatibility only. If your housing is not listed, reach out to our team before ordering.

Can't find your part number? Look it up on the full pool filter cartridge cross-reference chart.

Reviews

What pool pros and homeowners are saying

Need help fitting?

Not sure if this fits your housing?

Enter your current cartridge's part number, your housing model, or a competitor number — we'll check it against this filter and the full catalog.

Questions

Fit, replacement & ordering

Still unsure after reading these? Send us the number stamped on your old cartridge and we will confirm the fit.

How do I confirm this cartridge fits my system?

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 Specifications tab. A variance of about 1/8 inch is normal — anything larger usually means a different housing model.

Which part numbers does this cartridge replace?

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.

Which filter systems does this cartridge fit?

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.

Is this a genuine Pentair® part?

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.

How often should I replace my filter cartridge?

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.

What if it does not fit my housing?

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.

Other sizes in this family

If your housing is a different model

All Pool and Spa Filters →
Back to all filters

*Perfect Fit Guarantee applies to the OEM and aftermarket cross-references listed on this page; brand names, models and part numbers identify compatibility only. We ship to the 48 contiguous United States only; free standard shipping applies to those orders with no order minimum, and expedited service is priced at checkout. Every cartridge carries a 6-month limited warranty against defects in materials and manufacturing, separate from our 30-day return policy.