gratulations.. I had the same problem on one of my hookahs, a mz... I took a hammer and another thin object and started to hammer the hole underneath the heart that goes to the hose.. it was a small piece of metal that was covering maybe 15%of the hole..
well.. after some angry hittings with the hammer since it didnt want to brake loose, the whole hoseport brake out of my shisha.. it was like a small pipe that was connecting with the hose on one side and was a hole on the otherside wich is the one located underneath the heart..
So now you guys now how mz hearts look like and is constructed.. dont do my mistake! My MZ is ruined!!