These polishing cartridges come with instructions for use for quick connectors that require tubing to be inserted from both ends to the stop. 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 type 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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