No, those are specific to Culligan. I am not a fan of that design, I have seen way too many of that design fail in the field. i am sure anyone who has a few years of field service has seen that design fail as well. Modern designs use an o-ring, not a flat seal. The pressure of tightening it and any minor misalignment put excessive stress on the plastic nut which can fail in a few years.
Any luck on finding the 1" Flex connectors with John Guest ends?