[MrBasse]

How often are you reusing your ptc fittings? I used to work for Parker in their Brass Products Division. The teeth that grab onto the tubing is stamped from an almost nonexistently thin piece of metal. They are designed to be used just a few times, but it typically isn't an issue to reuse a dozen times or so.

If with new tubing and new fittings you push the tube in and can pull it out by hand you have three choices: 1. Throw away the tubing because it's junk 2. Throw away the fittings because they are junk 3. Both 1 and 2.

If you write a nice email to Parker they often will donate some fittings in a random grab bag kind of way. I was in the design department, but got a tour of the quality assurance area a few times. Our leak rate was more like one in a thousand rather than one in a hundred. And those were typically just because the orings got sheared by a crooked tube.

Edit to add: PTC fittings were developed for tractor trailer braking systems, if hose barbs were more reliable they would use them for that industry where air is used to stop the biggest vehicle on the road. Stick with the fittings you have now, maybe check new suppliers or brands if needed.