There is none on my 2012 XT276. I never use it and would like to disconnect it so don't have the winterize/de-winterize by opening the door twice a year. IMO it's a useless piece of junk with a lousy spray head.
I pulled the housing assembly out from the outside wall and found out it's plumbed in direct ... no shut off valves. It's all PEX plumbing and very tight quarters with little room to work so have to put up with it.
Your 2016 unit may be different. ???
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.