OK, I blew it.  Winterized the camper my self and left one faucet closed.
Apparently there was just enough water to cause it to break the cap nut that
holds the outside faucet control to the box.  It also serves to hold the
actual flow control spigot inside the housing.  Simple plastic fitting much
like a standard flare fitting that holds the supply line (compression
fitting) to a toilet flush control.

My dealer can sell me a whole outside shower box that has new faucets etc
but I really only need 1 (or 2 if I get a spare) of these simple plastic
parts.  To see what it is I am after you need to remove the knob on one of
the outside shower faucets.  The plastic cap nut that the shower spigot fits
through is all I need.

Any ideas would be helpful.  One size does not fit all by the way.  This one
says "Fontana" on the inside of the box that houses the faucets and shower
head when not in use.

Really can't see 45 to 80$  for a full replacement unit when this 50 cent
part is all I really need.