Our 1999 Hunter 380 was just launched, filled the fresh water tank and starting running all the water to get rid of the "pink stuff". About 5-10 minutes into it the hot water hose under the sink in the head just popped out of the grey L shaped plumbing fitting. I plugged it back in and just keeps popping out again as soon as I turn the water presure back on. How the heck is that plastic tube supposed to stay in there? Thanks