Some SCBA air packs to have a quick connect attaching the cylinder to the high-pressure hose feeding the reducing block. This quick connect reduces the time and effort it takes to change cylinders.
Most SCBA cylinders have a threaded valve that screws into the high-pressure hose making an air-tight connection. It takes a few turns to make the connection and this process does add a bit if time. If done in a hurry or in an improper manner, it is possible to cross thread this connection. Threaded connections ensure an air tight and locked connection.
The quick connect, shown in the two pictures, has one inherit problem: the possibility of the connection not snapping in correctly. I have experienced this in training where the cylinder was connected, appeared to have snapped in properly, (the lights and sound activated indicating the connection) only to have the valve pop back out once the cylinder was opened. To be sure the connection is made, pull back on the cylinder valve in an attempt to pull it out. If connected properly, it will not come out.
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Jeremiah SellersFriday, October 05, 2012 1:54:12 AMThats why ill stick with the threaded connections