Unfortunately I read the reviews after I bought and tried to install them thinking I was buying OEM replacement cartridges. The first two cartridges are fine, but the charcoal filter leaks horribly. I've tried rebuilding it a few times and found that the replacement cartridge doesn't have a bottom nipple, so I don't think it seats properly to create an airtight seal. This has also been addressed in other reviews. Buyer Warning. Now I have to send a battle back as I have opened all (4) components.
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