umm...I dont think they work that way.... I could be wrong.. But I think they are the equivalent to a barb to barb fitting...except its an OD connection... If you disconnect the tubing, the water will come gushing out
I DID find a different kind of barb though (only good with 3/4 OD minimum though) thats really good. doesnt need a hose clip... They're called push-connect barbs and you actually have to cut the hose and slice it around the barb to get rid of it.. Otherwise it wont budge.. The barbs are wider and and more pronounced and theres a ridge that the tubing settles under at the end...
Im hoping to get a bunch of those if I can leave early from the office sometime this week. The hose clamps are tearing away at the tygon tubing since its very soft:P