ORIGINAL: enrico63

Yes those valves are not zero loose but self sealing . You must put 2 valves for each tube and a small piece of tube between the valves. So when you disconnect the wings you have only to leave the tube between valves and there is no leacl because the valves automatically close at tube disconnecting. THe valves name is QSK 4 or QSKK 4 for the wall mounted valves. I will post a pic later. regards