These polishing cartridges come with quick coupler instructions for use. To do this, it is sufficient to insert the pipes from both ends as far as they will go. But it won't work. The ends have no proper connectors at all. They must be purchased separately, as do threaded nut-bolt connections. When I've bought polishing cartridges in the past, they've always come with shark bite or John Guest style tips and clips to hold the clips securely. Ordinary line filters for refrigerators even have ends. I'm disappointed. There is an additional cost and the instructions are misleading.
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