Pleatco PRB12L-4 = Unicel C-2613 = Filbur FC-2350

13 sq ft hot tub filter, 2-7/8" diameter × 29-1/4" long. Top: 1-1/16" open · Bottom: 1-1/16" open. Pleatco application: Standard & High SF Module Filters (MX Series), Lifeguard CL 29, CL29x, Rainbow.

Interchangeable cartridges

Unicel C-2613 confirmed by: Pleatco p.47 (Unicel to Pleatco cross reference) Unicel p.5 (Cartridges by series (dimensional listing))
Filbur FC-2350 confirmed by: Pleatco p.48 (Filbur to Pleatco cross reference) Filbur p.33 (Reverse cross reference (Unicel to Filbur))

Check before you order

Unicel C-2613 rates it 12 sq ft (vs 13 sq ft); filter area ratings differ by maker.

Published dimensions, side by side

Each manufacturer measures a little differently. Compare these with your old cartridge.

As published by	Pleatco PRB12L-4 source	Unicel C-2613 source
Outside diameter	2-7/8"	2-7/8"
Length	29-1/4"	29-1/4"
Top end	1-1/16" open	1-1/16" / open
Bottom end	1-1/16" open	1-1/16" / open
Filter area	13 sq ft	12 sq ft
Pleats	not listed	41
Media weight	4 oz/yd²	4 oz/yd²

Where to buy

Search any retailer for C-2613 or PRB12L-4 or FC-2350. These are the same cartridge under different brand names.

In The Swim (link coming soon)FiltersFast (link coming soon)Check price at Amazon

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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.

OEM number	Listed in
`17-2010`	Pleatco p.31: OEM part # column Unicel p.52: OEM cross reference: Pentair Pool Prod - Rainbow Plastics
`R173327`	Pleatco p.31: OEM part # column Unicel p.47: OEM cross reference: Pentair Pool Prod
`17-2046`	Pleatco p.31: OEM part # column
`R173328`	Pleatco p.31: OEM part # column

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.

Pentair Pool Prod (models: Standard & High Sq.Ft. Module, Filters; OEM R173327) Unicel p.47
Pentair Pool Prod - Rainbow Plastics (models: Lifeguard CL-29; OEM 17-2010) Unicel p.52

FAQ

What is the Unicel equivalent of Pleatco PRB12L-4?

The catalogs cross-reference Pleatco PRB12L-4 to Unicel C-2613.

What is the Filbur equivalent of Pleatco PRB12L-4?

The catalogs list Filbur FC-2350.

What size is the PRB12L-4 filter?

Pleatco lists PRB12L-4 as 2-7/8" outside diameter by 29-1/4" long, top: 1-1/16" open, bottom: 1-1/16" open, 13 sq ft.

Which OEM part numbers does it replace?

Listed OEM numbers: 17-2010, R173327, 17-2046, R173328.

Sources: 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.