Pretty much any of the usual RV parts sources, including Amazon, carry them. Changing one just requires removing the screws from the existing port, prying it away from the wall, and disconnecting it from the water line behind it. Reverse the process to reinstall it, using thread tape and fresh butyl putty as needed to seal it to the wall. Some of the replacements come with both included.
Dutch
2001 GBM Landau 34' Class A
F53 chassis, Triton V10, TST TPMS
Bigfoot Automatic Leveling System
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox baseplate