Diameter chart

4" diameter filter cartridges

89 rich records grouped by measured length. Check exact decimal or fractional values in each cartridge record.

Dimensions in this diameter bucket

This page contains 89 replacement cartridges with lengths from 2-15/16" to 26-11/16"; measure the exact diameter and length before comparing rows. The most common end-cap configurations are top 2-1/8" / open with bottom 2-1/8" / open, and top molded cone handle with bottom 1-1/2” male thread/MPT. The overlapping Unicel pages are 4000 series and Other series.

2–3" long

4" diameter, 2–3 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4317	—	—	4-1/4" × 2-15/16"	single-source

3–4" long

4" diameter, 3–4 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4313	PBW4PAIR	FD-3753	4-1/4" × 3-3/4"	cross-checked against 2 sources

4–5" long

4" diameter, 4–5 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4310	PWW10PWW10-JH-PAIRPWW10PAIR	FC-3077	4-1/4" × 4"	cross-checked against 3 sources
4CH-19	PSG13.5PSG13.5P4	FC-0122	4-5/8" × 4-5/8"	cross-checked against 3 sources
C-4302	PSS17.5	FC-0183	4-5/8" × 4-5/8"	cross-checked against 2 sources
C-4401	PRB17.5SF-JH-PRB17.5SF-JH-PAIRPRB17.5SF-PAIR	FC-2386	4-15/16" × 4-5/8"	cross-checked against 3 sources

5–6" long

4" diameter, 5–6 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
4CH-15	—	—	4-5/8" × 5-3/16"	single-source
C-4316	—	—	4-15/16" × 5-1/2"	single-source

6–7" long

4" diameter, 6–7 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4314AM	—	—	4-5/8" × 6"	single-source
4CH-22	PFF25	FC-2399	4-15/16" × 6-5/8"	cross-checked against 2 sources
4CH-23	PFF25TC-P4	FC-2400	4-15/16" × 6-5/8"	cross-checked against 3 sources
C-4405	PRB25SF-JH-PRB25SF-JH-PAIRPRB25SF-PAIR	FC-2387	4-15/16" × 6-5/8"	cross-checked against 3 sources
4CH-20	PHC25PHC25P4PSG25P4	FC-0125FC-0185	4-5/8" × 6-3/4"	cross-checked against 3 sources
4CH-920	—	—	4-5/8" × 6-3/4"	single-source
C-4303	PSANT20	FC-0185	4-5/8" × 6-3/4"	cross-checked against 2 sources

7–8" long

4" diameter, 7–8 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4315	PIC15	FC-0200	4-1/4" × 7-1/8"	cross-checked against 2 sources
4CH-925	PSANT20P3	FC-0126	4-5/8" × 7-1/4"	cross-checked against 2 sources

8–9" long

4" diameter, 8–9 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
4CH-21	PTL18PPTL18P4	FC-0121	4-5/8" × 8"	cross-checked against 3 sources
4CH-25	—	—	4-5/8" × 8"	single-source
4CH-252	PMA20-F2M	—	4-5/8" × 8"	cross-checked against 2 sources
C-4304	PC7-TC	FC-3711	4-1/4" × 8"	cross-checked against 2 sources
C-4306	PGF5	FC-3742	4-1/4" × 8"	cross-checked against 2 sources
C-4307	PGF7	FC-3744	4-3/4" × 8"	cross-checked against 2 sources
C-4309	PGF10	FC-3743	4-3/4" × 8"	cross-checked against 2 sources
C-4600	PMS8TC	FC-3850	4-5/16" × 8"	cross-checked against 2 sources
C-4602	—	—	4-5/16" × 8"	single-source
C-4605	PMS8	FC-3810	4-5/16" × 8"	cross-checked against 2 sources
C-4607	PC7-120PC7PAIR	FC-3710	4-1/4" × 8"	cross-checked against 2 sources
C-4608	PC8	FC-3736	4-3/4" × 8"	cross-checked against 2 sources
C-4609	—	—	4-3/4" × 8"	single-source

9–10" long

4" diameter, 9–10 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
4CH-935	PWW35L	FC-0170	4-15/16" × 9-1/4"	cross-checked against 2 sources
C-4335	PRB35-IN	FC-2385	4-15/16" × 9-1/4"	cross-checked against 3 sources
4CH-24	PGS25P4	FC-0131	4-5/8" × 9-3/4"	cross-checked against 3 sources
C-4324	PGS25PGS25P4	FC-0187	4-5/8" × 9-3/4"	cross-checked against 2 sources
C-4402	—	—	4-5/8" × 9-3/4"	single-source
C-4610	PSR15PSR15-4	FC-2510	4-1/2" × 9-3/4"	cross-checked against 2 sources
C-4328	—	—	4-15/16" × 9-13/16"	single-source
C-4428	PPI25PPI25D	FC-2620	4-15/16" × 9-13/16"	cross-checked against 3 sources

10–11" long

4" diameter, 10–11 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4429	DSF25-50	FC-3082	4-15/16" × 10-3/8"	cross-checked against 2 sources
C-4431	—	—	4-15/16" × 10-3/8"	single-source
C-4603	PHP11	FC-3756	4-1/4" × 10-7/8"	cross-checked against 2 sources

11–12" long

4" diameter, 11–12 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4611	PC11	FC-3730	4-3/4" × 11"	cross-checked against 2 sources
C-4339	PWW40	FC-2915	4-15/16" × 11-1/4"	cross-checked against 3 sources
C-4327	—	—	4-5/8" × 11-5/8"	single-source
C-4327AM	—	—	4-5/8" × 11-5/8"	single-source
C-4340	PMT40	FC-3081	4-15/16" × 11-5/8"	cross-checked against 2 sources
C-4403	PCP20	FC-3073	4-5/8" × 11-5/8"	cross-checked against 2 sources
4CH-30	PTL25H-PPTL25P-4PTL25P4	FC-0141FC-3091	4-5/8" × 11-7/8"	cross-checked against 3 sources
C-4312	PA12	FC-1210	4-5/8" × 11-7/8"	cross-checked against 3 sources
C-4320	PA20	FC-1215	4-5/8" × 11-7/8"	cross-checked against 3 sources
C-4325	PA225	FC-1220	4-5/8" × 11-7/8"	cross-checked against 3 sources
C-4332	PMT25PMT35	FC-1612FC-1613FC-2625	4-15/16" × 11-7/8"	cross-checked against 2 sources
C-4430	—	—	4-15/16" × 11-7/8"	single-source

12–13" long

4" diameter, 12–13 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
4CH-950	PDO-UF25	FC-0173	4-5/8" × 12"	cross-checked against 2 sources
C-4329	PIC25	FC-0210	4-1/4" × 12"	cross-checked against 2 sources
C-4311	PDS45	FC-2394	4-15/16" × 12-1/4"	cross-checked against 2 sources
4CH-934	—	—	4-5/8" × 12-1/2"	single-source

13–14" long

4" diameter, 13–14 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4321	—	—	4-15/16" × 13-5/16"	single-source
C-4326	PRB25-IN	FC-2375	4-15/16" × 13-5/16"	cross-checked against 3 sources
C-4621	—	—	4-15/16" × 13-5/16"	single-source
C-4625	PRB25-IN-4	FC-2370	4-15/16" × 13-5/16"	cross-checked against 3 sources
C-4637	PRB37-IN	FC-2380	4-15/16" × 13-5/16"	cross-checked against 3 sources
C-4950	PRB50-IN	FC-2390	4-15/16" × 13-5/16"	cross-checked against 3 sources
4CH-926	—	—	4-15/16" × 13-1/2"	single-source
4CH-949	PWW50L	FC-0172	4-15/16" × 13-1/2"	cross-checked against 2 sources

14–15" long

4" diameter, 14–15 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4308	POX25-IN	—	4-15/16" × 14-9/16"	cross-checked against 2 sources
4CH-50	PTL50PPTL50P4	FC-0151	4-5/8" × 14-3/4"	cross-checked against 3 sources
C-4301	PMT27.5	FC-1616	4-15/16" × 14-7/8"	cross-checked against 2 sources
C-4305	PMT45PMT50	FC-1617FC-1618FC-1630	4-15/16" × 14-7/8"	cross-checked against 3 sources
C-4345	PST45	FC-2660	4-15/16" × 14-7/8"	cross-checked against 2 sources
C-4347	PMT45	FC-2630	4-15/16" × 14-7/8"	cross-checked against 2 sources

15–16" long

4" diameter, 15–16 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
4CH-940	PDO-UF40PSG40N-M	FC-0177	4-5/8" × 15"	cross-checked against 2 sources

16–17" long

4" diameter, 16–17 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
4CH-35	PTL35PPTL35P4	FC-0161	4-5/8" × 16"	cross-checked against 3 sources
C-4616	PC16	FC-3735	4-3/4" × 16"	cross-checked against 2 sources
C-4440	PSD40	FC-2710	4-5/8" × 16-3/4"	cross-checked against 2 sources

17–18" long

4" diameter, 17–18 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4349	PAE50	FC-6310	4-15/16" × 17-3/8"	cross-checked against 3 sources
C-4346	PSI45	FC-2670	4-15/16" × 17-3/4"	cross-checked against 2 sources
C-4449	PSI45-O	FC-2640	4-15/16" × 17-3/4"	cross-checked against 3 sources
C-4604	PHP18	FC-3758	4-1/4" × 17-7/8"	cross-checked against 2 sources

18–19" long

4" diameter, 18–19 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4601	PL18	FC-3745	4-3/4" × 18"	cross-checked against 2 sources
C-4618	PC18	FC-3740	4-3/4" × 18"	cross-checked against 2 sources

19–20" long

4" diameter, 19–20 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
4CH-65	PTL65H-P	FC-0171	4-5/8" × 19-5/8"	cross-checked against 2 sources

20–21" long

4" diameter, 20–21 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4975	PRB75	FC-2395	4-15/16" × 20-1/8"	cross-checked against 3 sources

23–24" long

4" diameter, 23–24 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4970	PCAL75	FC-2930	4-15/16" × 23-5/8"	cross-checked against 3 sources
C-4995	PCAL100	FC-2940	4-15/16" × 23-5/8"	cross-checked against 3 sources
C-4350	—	—	4-5/8" × 23-3/4"	single-source
C-4351	PIC50PIC50N	FC-0184	4-1/4" × 23-3/4"	cross-checked against 2 sources
C-4360	PIC60	FC-0179	4-1/4" × 23-3/4"	cross-checked against 2 sources

26–27" long

4" diameter, 26–27 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-4999	PRB100	FC-2397	4-15/16" × 26-11/16"	cross-checked against 3 sources

A nominal diameter bucket includes fractional measurements. Use the exact dimension lookup and follow the measurement guide.