Marquis Spas OEM 20043 spa filter (C-5434)

Marquis Spas (listed as Pacific Marquis in the Filbur catalog)

Replacement numbers

Unicel C-5434, Pleatco PPM60TC

Fits Marquis Spas OEM 20043, 370-0216.

Diameter 5-3/16" (132 mm)Length 19-5/8" (498 mm)60 sq ft

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UnicelC-5434
PleatcoPPM60TC (as printed in the Filbur catalog Marquis Spas section (printed p.43); not found in the Pleatco 2023 Unicel cross reference)
FilburFC-3634
Topclosed
Bottom1-5/8" (41 mm) / open
Ø 5-3/16" (132 mm)19-5/8" (498 mm)Side view · end views belowTopBottom
Top: closed
Bottom: 1-5/8" (41 mm) / open
Drawn to scale from the listed diameter and length and open-end sizes. Handles, threads and closed ends are drawn as symbols, not to scale. 60 sq ft media.

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Marquis Spas files this cartridge as C-5434 cartridge (OEM 20043), in the Marquis Spas (listed as Pacific Marquis in the Filbur catalog) group. Numbers on the row: OEM 20043, 370-0216; Unicel C-5434; Pleatco PPM60TC; Filbur FC-3634. 5-3/16" across, 19-5/8" long, top closed, bottom 1-5/8" / open, 60 sq ft.

20043 carries this note from the catalogs: Closed-top cartridge, listed by Unicel as Pacific Marquis (new). Unicel's spec table rates it 58 sq ft and notes the original was 40 sq ft (109 pleats), upgraded to 60 sq ft in the replacement. Unicel lists OEM 370-0216; Filbur prints 370-216.

PPM60TC is the Pleatco string Filbur prints next to C-5434 (OEM 20043) on printed p.43. PPM60TC itself is absent from Pleatco’s 2023 Unicel cross-reference.

Before ordering C-5434, compare it with 5CH-512 differs by Unicel 5CH-512, no Pleatco number, no Filbur number, 16" long, top bar handle, bottom 2” male thread/MPT, 50 sq ft, OEM 20690, note says Marquis's own filter finder lists part 20690 as the threaded 50 sq ft filter for Crown Series spas from 2021, Elite models (Woodstock, Vegas, Hollywood, Broadway, Monaco Elite) from 2020, and the same Elite models in the 2018–2019 Celebrity Series. Two Marquis parts dealers describe 20690 as 5-3/16" x 16" with a handle top and 2" MPT thread, 50 sq ft, which matches Unicel's 5CH-512; they describe it as used on Celebrity Elite and V150 models rather than naming Crown. Marquis's 2026 Crown owner's manual describes a single 35 sq ft cartridge, which does not match the finder's 50 sq ft 20690 for Crown; see our Marquis model-year page.; and C-5346 differs by Unicel C-5346, Pleatco PPM50TC, Filbur FC-3638, 14-1/8" long, 50 sq ft, OEM 20044, note says Closed-top slip-on cartridge, old style. Marquis's own filter finder lists 20044 as the slip-on 50 sq ft filter for 1997–1999 Signature Series spas, which matches Unicel's C-5346 (5-3/16" x 14-1/8", closed top, 1-5/8" open bottom, 50 sq ft) and Filbur's FC-3638 of the same size. The second factory number still differs: Unicel lists 370-0236, while Filbur prints 370-217 for the same size..

Left blank on purpose: no model/model-year fitment in sources.

Pages checked for 20043: Unicel 2026 Replacement Guide on C-5434 (OEM cross reference (Marquis Spas section), PDF p.44 (printed p.40); spec table PDF p.10 (printed p.6)). Filbur Catalog & Reference Guide on C-5434 (Product by Pool/Spa Manufacturer (OEM), Marquis Spas, printed p.43 (PDF p.22)).

If you know the Marquis Spas model and not the part number, use the Marquis Spas filter by model and year lookup.

Check the cartridge you removed

Measure diameter, length, and both ends, then compare them with the figures above. The steps are in the measuring guide. Why the bottom decides whether it seals: open-end vs threaded filters. Power, the retainer, and not running the spa empty: how to install a cartridge. Number formats: how Filbur, Unicel and Pleatco numbers compare.

Other Marquis Spas cartridges

All 9 Marquis Spas spa filters

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Cleaner and test strips

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Filter cleaner and test strips

Sources

Not in sources: no model/model-year fitment in sources.