Pleatco PRB12-4 = Unicel C-2612 = Filbur FC-2340
12 sq ft hot tub filter, 2-7/8" diameter × 19-1/2" long. Top: 1-1/16" open · Bottom: 1-1/16" open. Pleatco application: Standard & High SF Module Filters (MX Series), Lifeguard CL 19x, Rainbow.
Interchangeable cartridges
- Unicel C-2612 confirmed by: Pleatco p.47 (Unicel to Pleatco cross reference) Unicel p.5 (Cartridges by series (dimensional listing))
- Filbur FC-2340 confirmed by: Pleatco p.48 (Filbur to Pleatco cross reference) Filbur p.33 (Reverse cross reference (Unicel to Filbur)) Filbur p.8 (Dimensional cartridge listing)
Published dimensions, side by side
Each manufacturer measures a little differently. Compare these with your old cartridge.
| As published by | Pleatco PRB12-4 source | Unicel C-2612 source | Filbur FC-2340 source |
|---|---|---|---|
| Outside diameter | 2-7/8" | 2-7/8" | 2-7/8" |
| Length | 19-1/2" | 19-1/2" | 19-1/2" |
| Top end | 1-1/16" open | 1-1/16" / open | 1-1/16" open |
| Bottom end | 1-1/16" open | 1-1/16" / open | 1-1/16" open |
| Filter area | 12 sq ft | 12 sq ft | 12 sq ft |
| Pleats | not listed | 62 | not listed |
| Media weight | 4 oz/yd² | 4 oz/yd² | not listed |
Where to buy
Search any retailer for C-2612 or PRB12-4 or FC-2340. These are the same cartridge under different brand names.
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OEM part numbers this cartridge replaces
As printed in the cited aftermarket catalogs. Match the number on your old cartridge or in your spa manual exactly.
Hot tub brands that use it
From the spa-manufacturer cross reference in the Unicel 2026 Replacement Guide. A brand may use several sizes, so check your measurements.
- Jacuzzi Whirlpool Bath (models: Cambio; OEM 2945000) Unicel p.42
- Pentair Pool Prod (models: Standard & High Sq.Ft. Module, Filters (MX Series); OEM R173326) Unicel p.47
- Pentair Pool Prod - Rainbow Plastics (models: Lifeguard CL-19X; OEM 17-2047) Unicel p.52
FAQ
What is the Unicel equivalent of Pleatco PRB12-4?
The catalogs cross-reference Pleatco PRB12-4 to Unicel C-2612.
What is the Filbur equivalent of Pleatco PRB12-4?
The catalogs list Filbur FC-2340.
What size is the PRB12-4 filter?
Pleatco lists PRB12-4 as 2-7/8" outside diameter by 19-1/2" long, top: 1-1/16" open, bottom: 1-1/16" open, 12 sq ft.
Which OEM part numbers does it replace?
Listed OEM numbers: 2945000, 17-2047, R173326.
Sources: Filbur Product Catalog and Reference Guide (2024) · Filbur Product Catalog and Reference Guide (2024) · Pleatco 2023 Catalog & Cross Reference Guide (Pentair) · Pleatco 2023 Catalog & Cross Reference Guide (Pentair) · Pleatco 2023 Catalog & Cross Reference Guide (Pentair) · Unicel 2026 Replacement Guide. Last checked 2026-10-21.