I quickly discovered there was no shut-off valve too. So I replaced the factory head with a new head with a switch. MUCH better than the factory head, and now it's a lot easier to take efficient showers.
2014 Jay Flight 28 BHBE
2015 RAM 2500 6.4L HEMI, Tradesman 4x4, 3.73
Blue Ox SwayPro (BXW 1503)
Upgraded from an REI internal frame backpack and a Eureka 1/2 dome tent!