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Measure the outside diameter of the cartridge.
Measure the overall length of the cartridge including the end caps. Do not include any handles, strings, etc. A more accurate measurement is made by measuring through the center of the cartridge when possible.
If the top and/or bottom is open, measure the inside diameter of the opening.
Make note of the manufacturer (OEM) and model number of the filter the replacement cartridge will be installed.
Take note whether or not there is a center core in center. Also count the number of pleats.
Note: Filter measurements may vary. Allow a variance of: +/- 1/16 in. or +/- 2 mmOrder Your Filter Cartridge