Great fit, fully functional. Prices for reverse osmosis membranes and some conventional filters vary widely. They are affordable, well packaged and 100% functional. One small caveat - check the connections on the polishing filter before you take it apart - some filter cartridges have threaded connections (like this one) and some have push-in connections (like my old filter I replaced) - no big deal, but be armed with the right fittings to adjust them if necessary.
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