STEP 1- Unscrew the cap counterclockwise, then take out the cartridge and the o-ring on the top
| STEP 2- Clean the o-ring and wipe it with a shop towel to dry it, then lubricate the o-ring with some silicone lubricant
| STEP 3- Put the o-ring back in its place and ensure it is seated, then drop the new cartridge into the place
| STEP 4- Put the cap back on top and turn it clockwise to tighten
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