Water line compatability?

thanks folks, I am on it. :C

I just saw them on Amazon. Search for "flair-it wrench".

The tool is available online and at State Trailer Supply, Salt lake city,
and can be ordered online at their website... Cost - about $10 If you don't see it, Call them. They are great to work with.
Get the tool if you have a Flair-It system. Yes - pliers will work in a pinch but the ratcheting tool (plastic) works on 1/2 inch and 3/4 inch and it does not chaff the fitting with burrs etc. Those burrs make it hard to keep clean and spotless underneath sinks, lavs etc. Don't be afraid that the tool is plastic. It is plenty rugged, doesn't rust, is light weight and compact for any drawer or tool box.

State Trailer also carries all types of Flair-It fittings and adapters. Buy a few spares, 2 couplings and a small length of PEX. I throw all of them in a plastic zip-lock and just leave them under the sink or behind the water heater along with the tool. I never have had a leak. Knock on wood.
https://www.statetrailer.com/

So is that custom tool available at the big box store like Lowes?

I use nothing but flair-it fittings. My whole house it flair-it fitting too. All except for the big stuff, they use the crimp clamps on those.

I like the Flair-It and use the custom wrench to tighten and loosen fittings.

Amazing simple tool. Well worth the few bucks to purchase the right tool for the job. ;)

I have done some plumbing mods to my RV with the PEX and Flair-It setup. Works like a charm.

( I "T'd" into the cold water line, ran a short line to a bypass valve. From the bypass valve, I ran a short line to a 2 gallon accumulator tank, and another line to an "L" then to a shut-off. When winterizing, I can bypass the accumulator tank, then use the shut-off to flush antifreeze through my added lines.)

I have not done pressure plumbing on a trailer, but have a lot of experience with large power boats that also use Flair-It fittings. I love PEX. As Dave says, shark bite fittings work, but I like the Flair-It and use the custom wrench to tighten and loosen fittings. The secret I have found is to use a heat gun on a low setting. The fittings slide in and nuts go on with ease. Since the PEX and fittings are cheap, take a section of PEX and just test it and try it. You will be amazed. Also, try heating the PEX a little and bending. You may save an unnecessary elbow and one more possible leaking joint.

if I am using the type of fittings you described for PEX, I use a hair drier to heat up the PEX some to make the barb go in more easily due to the increased flex.

Don't overlook the use of shark bite fittings for those hard to get into places. i have never had a shark bite leak in the tiniest amount