The topic has come up many times of diffrent types of water lines this is just one of the many.
Propress has been on the market for awhile now and im seeing more everyday it has it's place but alot of jobs are writing it into their specs for the whole building water and heating system. I have also noticed more failure of the fittings could be brand new or installed weeks or months earlier.
This is just one example today I got a emergency call to go to a job that we had just turned over to the owner for a leak on the water main on second floor. The leak was on a 2-1/2x2-1/2x2" copper tee it had been installed a year ago and passed the air test of 100 lbs and the water had been on to the building for 3 months. I cut the fitting out expecting to find that it was not seated fully into the fitting or not properly crimped. I found that it was completly seated the pipe was cut square and was crimped properly, no reason I could see for it to leak.
I made my repairs also with propress because that is spec for the job site, and installed slip couplings so I could get it all back together and turned the water back on and guess what the new coupling I put in now leaks by this time it's 6:30 and nowhere to get parts, wish i could have just soldered it.
Here are some pic's of the fittings and tool so if you run into.
This is what the fittings look like.
This is the O-ring that makes the seal inside the fitting.
This is the one I cut out that was leaking the arrow is pointing to the leak.
And this is what the tool itself looks like the main tool will do up to 2 inch and then the other kit will do 2-1/2" to 4".