Outside shower!

I have a 2005 Alfa see ya 5th wheel. Today I was replacing the city water inlet because the check value was bad....i untwisted the old one and when I let go to turn around to grab the new one, the water line went up into (lord only knows where) and I cannot see it nor reach it to twist the new part on ????????. First off.....why would they have it like that???? And 2nd, how on earth would I get to it now??????