1. Measure the Outside Diameter of the End Cap. Use exact measurement (+ or - 1/32")

2. Measure Cartridge Length. End cap to end cap (+ or - 1/16") exclude any handles or extensions.

3. Measure Top Inside Diameter. Use exact measurement (+ or - 1/32")

4. Measure Bottom Inside Diameter. Use exact measurement (+ or - 1/32")

5. Note the Name and Model of the filter the cartridge came out of.

6. Identify the correct Top and Bottom type.
Types are listed below.

Open Top/Bottom	Open Top/Bottom w/Gasket	Closed Top
Closed Top w/ String Handle	Castle Top	Molded Cone Handle
Semi-Circular Handle	Open Bottom w/ Male Slip Fitting	Open Bottom w/ ThreadedFitting