It is a quick connect,they can be disconected. but sometimes not so easy.I'm finding them more and more on new sink faucets.
I would asume manufactures like them for speed of installation.
Sometimes the will spurt a little water the first time they are preasureized but stop once they are seated.
2010 298 RLS Eagle
99 Ford F-250
1 Toy Fox Teror
1 Tiny Chi Chi Wa that rules all of the above.