They rely on an EPDM rubber O ring. I don't see why WITHOUT MOVEMENT, that would last less than 25 years (what they're supposed to be rated for), but in a pipe subject to movement, I'd think twice about this.
Also, I would think that the rubber can take a set. That shouldn't be a problem if you're installing it "forever", but after being installed for a couple of years, I wouldn't feel comfortable re-using the connection, after removing it. When it's fresh though, it seems like you can disconnect and reconnect them about as often as an air line QD fitting.
I agree, Im a plumber.
I work with a remodel guy, that for sometime used shark bites to cap lines. Well one day one cap blew off. Then in turn flooded 4 condo's. So now he hires me, to "cap" lines.
The trick to them is common sense. If the pipe has no burs and is clean. Then fine. If the pipe is supported, with no movement. The shark bite is as good as a rubber. So 95% of the time a rubber is "good".
All of us know how rubbers work.
They say there approved for heating. Well i personally put one on a guys heating system (oil 210 deg. water) Because it was all i could get at 10 pm.
After a month the fitting leaked. Ruined his floor.
I was covered because i said it was temporary. He didnt want me to replace it after the weekend because there website said its ok..
I believe if, you have the piece of mind. DIY. Its ok with me, because a knowledgeable homeowner, will see a leak. And fix it accordingly.
If its a home were your not there. Would you trust it?
Would you put a compression coupling on your wifes car's brakes?
A 8 dollar fitting could cause allot of damage. Learn to sweat copper.