Sintax, hi i used to use S/S quicklock type couplers but found there is to many parts to them on the inside and was not happy with them really at all. Now i do it the same way as professional breweries with barrel unions and ball valves, simply turn off valve then unscrew barrel union.
Barrel unions aren't really quick snap locks or anything but i find they are the best way to build a brewery. Best of all they are the most professional way to set up your brewery, i think anyway.
In this pic you can see the valve from the HLT with a barrel union which connects the hot water line into the mash tun.
anyway sorry not really quick connects but like i said i reckon this way is the best and most 'professional'.
Jayse