A Measure the outside diameter of the cartridge.(+/- 1mm).

B Measure the overall length of the cartridge in inches (+/- 1/16),including the end caps. Do not include any handles, strings, etc.A more accurate measurement ismadeby measuring through thecenter of the cartridge when possible.

C If the top and/or bottom is open, measure the inside diameter ofthe opening (+/- 1mm). If the end cap is closed make note of its dentifying features (i.e. 'Handle', etc.).

D Make note of the manufacturer (OEM) and model number of the filter into which the replacement cartridge will be installed.

E Take note whether or not there is a center core.Also count the number of pleats (+/- 2).