This is a replacement for my old reverse osmosis mud cartridge. When I first looked at it, it turned out that both ends were sealed. I actually called their customer service and the rep told me it's just caps that pop instantly. Of course the rep was right, it just seemed like a solid piece. The caps popped right out and I used the existing fittings with the new cartridge. The total time for changing the cartridge was only a few minutes. I'll buy the next one in 6 months.
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