Compatible with Unicel
C-4301
Hot Tub Filter Cartridge, 28 Sq Ft, 4-15/16 x 14-7/8 In., Replacement for Unicel C-4301, Pleatco PMT27.5, Filbur FC-1610
Also sold as
Your number not here? Send it to us and we'll confirm the match.
OEM numbers listed for fitment identification only.
Specifications
| Compatible brand | Unicel |
|---|---|
| Category | Hot Tub & Spa Filters |
| Lead time | 15–25 days after order confirmation |
- MOQ 50 pcs · samples from 1
- Private label available
- Ships from our factory
Request wholesale quote
One request covers the whole list — no need to send them one by one.
Tiered pricing available above 1,000 pcs · OEM packaging available
Product overview
C-4301 is an aftermarket pleated hot tub filter cartridge, 4-15/16 in. in diameter and 14-7/8 in. long, with 28 sq ft of filter area. Top: open (2-1/8" ID). Bottom: open (2-1/8" ID). Center opening: 2-1/8 in.
It interchanges with Pleatco PMT27.5 and Filbur FC-1610.
Pleatco lists PMT27.5 as discontinued in its 2025-26 catalog. This cartridge keeps the original 4-15/16 x 14-7/8 in. size, so it drops into the same filter housing.
OEM cartridges it replaces: Advantage Mfg. ELE-25 (top load); Martec CL-2200, CL-2800; Sonfarrel 220122, 220128, 220132.
Fitment notes: Nordic Hot Tubs: Model dated before 7/99.
Before ordering, measure the old cartridge — overall length, outside diameter and both end fittings. Some catalogs quote the length of threaded top-load cartridges with the thread and some without, so a quarter-inch difference between listings is common. We supply spa service companies, dealers and online retailers: MOQ 50 pcs per part, mixed cartons welcome, and single samples to confirm fit before a production order.
Fits these systems
Hot tubs and spas from Advantage Mfg., Martec, Nordic Hot Tubs, Sonfarrel, Thermo Spas of Connecticut.
Not sure it fits? Send us a photo of your part and we'll confirm. Send a photo
Often sourced together
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What OEM numbers does C-4301 replace?
POOLPOINT C-4301 is an aftermarket replacement cross-referenced to 220122, 220128, 220132, CL-2200, CL-2800, ELE-25 (top load), FC-1610 and PMT27.5. Those numbers identify fitment only — the part is manufactured by POOLPOINT, not by Unicel.
Is C-4301 a genuine Unicel part?
No. POOLPOINT manufactures compatible aftermarket replacement parts. We are not affiliated with, sponsored by or endorsed by Unicel; the brand name and OEM numbers are used to identify fitment only.
What is the minimum order quantity for C-4301?
MOQ is 50 pcs per part, and mixed cartons are welcome to reach the order minimum. Samples are a separate case — we supply single pieces so you can confirm fitment before committing to a production run.
C-4301
Hot Tub Filter Cartridge, 28 Sq Ft, 4-15/16 x 14-7/8 In., Replacement for Unicel C-4301, Pleatco PMT27.5, Filbur FC-1610