Diameter chart

3" diameter filter cartridges

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

Dimensions in this diameter bucket

This page contains 6 replacement cartridges with lengths from 3-1/2" to 14-11/16"; measure the exact diameter and length before comparing rows. The most common end-cap configurations are top 1-1/8" / open with bottom 1-1/8" / open, and top 1-1/16" / open with bottom 1-1/16" / open. The overlapping Unicel pages are 3000 series.

3–4" long

3" diameter, 3–4 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-3305	—	—	3-1/8" × 3-1/2"	single-source
C-3302	PIN3PAIR	FC-3751	3-1/8" × 3-11/16"	cross-checked against 2 sources

4–5" long

3" diameter, 4–5 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-3304	—	—	3-1/2" × 4"	single-source

7–8" long

3" diameter, 7–8 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-3310AM	—	—	3-7/8" × 7"	single-source

9–10" long

3" diameter, 9–10 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-3608	PS9	FC-3076	3-1/4" × 9-3/4"	cross-checked against 2 sources

14–15" long

3" diameter, 14–15 inch length
Unicel	Pleatco	Filbur	Dimensions	Verification
C-3612	PS12	—	3-1/4" × 14-11/16"	cross-checked against 2 sources

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