City water connector
All city water connectors have backflow preventers. Once in a while the springs get cocked and you will lose water if the cap is not screwed on tight.
Yours may or may not have a pressure regulator. I was just in Camping World today and the ones I saw with regulators were a couple of dollars more expensive, but didn't look any different from the unregulated ones.
Best to put a regulator at the RV park faucet anyway. That protects your hose as well as the trailer. I had a heck of a time teaching my wife that the regulator stayed with the hose, not with the faucet.
John W. Irwin
2005 Classic 28 "Sabre-Dog III"
2013 Silverado 2500HD Duramax/Allison LTZ
WBCCI #9632, TAC TX-10