insert fitting
 

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....

RO line keeps popping out of float switch
 

+1

I have a spare Kent if you're in a pinch, not sure they are stocked locally. The Eshopps is available at a few Calgary shops.

I use an Eshopps in my sump and a Kent in my mixing barrel.

I've been using that Kent float switch in my RO reservoir for 4 years without a problem.

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.

I'll stop at Home Depot tomorrow, are they pretty straight forward pieces of equipment? Like if I ask the plumbing guy for RO line sleeves, will he know what I'm talking about, or do they have another name?

I'd never heard if them before now, so I've never looked for one.