RO line keeps popping out of float switch

[Aquattro]

I use the Kent, have for 12 years and the line never popped off.

[The Codfather]

Not just the good ones use a insert, they just include it.
Any time that you use a plastic line in a compression fitting, you need an insert.
now JG fittings have a little safety factor, considering the bite.
In any pressure application, always use an insert fitting, they should be available at rona, home depot, etc....

[subman]

For my experience there is a sleeve that gets inserted into the ro line that keeps the line rigid enough to for a seal. I'm guessing the sleeve fell out the first time this happened. A quick stop at any hardware store should fix it.