Ours failed this summer, water running out of the bathroom vanity. I managed to pull the water lines down, and replaced the valve with a 75 cent 1\2 inch fitting from our hardware store.
from Alberta Canada
2011 Flagstaff 8526RLWS 5th Wheel
2011 Ford F250 4X4 Crewcab Superduty 6.7L Diesel
B&W 3300 Hitch for Ford 5th Wheel Prep package