
My system requires a replacement reverse osmosis cartridge FX12M. The TFM-18 included in this kit is significantly smaller in diameter than the FX12M/TLC-24 reverse osmosis cartridge normally included in the system. and the black body seal is much larger than the body that the reverse osmosis cartridge is inserted into. I'm not sure the cartridge will have a proper watertight seal once it's finally installed in the case.

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