Fits my iSpring reverse osmosis filtration system. Filter Model: TFC-1812-75 (the seller seems to be deleting information on the listing) You can match it to see if it matches what you have if you are unsure. If you're looking at this, you probably already have a reverse osmosis system, and like me, you've probably waited over 1-2 years to replace your filter. I understand they are under the counter somewhere. It is easy to install, unscrew the cap, take out the old one, put in the new one, screw it back on. THEN make sure to close the collection bottle valve and turn it on for 30 minutes to an hour to remove the sterile transfer fluid. Now pat yourself on the back and acknowledge that I've really helped you.
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