Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
Master Spas OEM PMA40L-F2M spa filter (6CH-402)
Master Spas Twilight Series
Replacement numbers
Unicel 6CH-402, Pleatco PMA40L-F2M
Fits Master Spas OEM PMA40L-F2M.
Diameter 6" (152 mm)Length 9-1/2" (241 mm)40 sq ft1 model listedPleatco PMA40L-F2M
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| Unicel | 6CH-402 |
|---|---|
| Pleatco | PMA40L-F2M (as printed in the Filbur catalog Master Spas (Twilight) section (printed p.43); not found in the Pleatco 2023 Unicel cross reference) |
| Filbur | FC-0317 |
| Top | semi-circular handle |
| Bottom | 2” male thread/MPT |
Bottom: 2” male thread/MPT
Drawn to scale from the listed diameter and length. Handles, threads and closed ends are drawn as symbols, not to scale. 40 sq ft media.
For Master Spas, 6CH-402 cartridge (OEM PMA40L-F2M) sits in Master Spas Twilight Series. The cross-reference prints OEM PMA40L-F2M; Unicel 6CH-402; Pleatco PMA40L-F2M; Filbur FC-0317. 6" across, 9-1/2" long, top semi-circular handle, bottom 2” male thread/MPT, 40 sq ft.
Catalog note for PMA40L-F2M: Unicel prints PMA40L-F2M (a Pleatco number) in its OEM column; Pleatco lists Master Spas Twilight OEM X268365 for PMA40L-F2M. Unicel: must remove black stand pipe.
PMA40L-F2M is the Pleatco string Filbur prints next to 6CH-402 (OEM PMA40L-F2M) on printed p.43. PMA40L-F2M itself is absent from Pleatco’s 2023 Unicel cross-reference.
Hot tubs named for PMA40L-F2M: Twilight Series, no year range printed, listed by Unicel 2026 Replacement Guide.
Hold 6CH-402 next to 6CH-940 differs by Unicel 6CH-940, Pleatco PWW50P3, Filbur FC-0359, 8-1/4" long, bottom injection molded 1-1/2" SAE thread, 45 sq ft, no OEM number, note says Unicel: for use in Master Spas swim spas; 6CH-352 differs by Unicel 6CH-352, Pleatco PAS40-F2M, Filbur FC-0312, 8" long, 35 sq ft, OEM PMA-R1, note says Unicel: must remove black stand pipe. Filbur cross-references 6CH-352 to FC-0312 but lists FC-0312 at 6" x 7".
Source locations for this Master Spas row: Unicel 2026 Replacement Guide on 6CH-402 (OEM cross reference (Master Spas section), PDF p.45 (printed p.41); spec table PDF p.12 (printed p.8)). Filbur Catalog & Reference Guide on 6CH-402 (Product by Pool/Spa Manufacturer (OEM), Master Spas (Twilight), printed p.43 (PDF p.22)).
Hot tubs listed for this cartridge
The rest of the Master Spas model list is the Master Spas filter by model and year lookup.
| Model / system | Years | Listed by |
|---|---|---|
| Twilight Series | not given | Unicel 2026 Replacement Guide |
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. Brand notes: Master Spas Eco-Pur filters. Number formats: how Filbur, Unicel and Pleatco numbers compare.
Other Master Spas cartridges
- 6CH-940 cartridge, 6" (152 mm) × 8-1/4" (210 mm)
- 6CH-352 cartridge (OEM PMA-R1), 6" (152 mm) × 8" (203 mm)
- 7CH-322 cartridge, 7" (178 mm) × 8" (203 mm)
- C-7330 cartridge, 7" (178 mm) × 7-1/4" (184 mm)
- 4CH-252 cartridge (OEM X268521), 4-5/8" (117 mm) × 8" (203 mm)
- 4CH-949 cartridge, 4-15/16" (125 mm) × 13-1/2" (343 mm)
All 13 Master Spas spa filters
Every number on this row, on one screen: cross-reference lookup. Published clean and replace intervals for this cartridge, and a buy link for the numbers above: replacement schedule and reorder. The interval comparison by brand: calculator.
Cleaner and test strips
Hose rinse and soak steps are in how to clean a cartridge. Named cleaners and strips are in filter cleaners and test strips.
Filter cleaner and test strips
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Leisure Time O Filter Clean Cartridge Cleaner Listing title: cartridge cleaner, 32 fl oz.
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SpaGuard Filter Cleaner Listing title: filter cleaner for spas and hot tubs, 1 quart.
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AquaChek SPA 6-in-1 Test Strips Listing title: reads total bromine, total chlorine, free chlorine, pH, total alkalinity and total hardness.
Pleatco PMA40L-F2M Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.