Inner sactum oil galley plug

From what you are telling me. is. that if I took a garden hose off the tap at the front of my house near where the water supply enters the house, and ran that hose thru an anti back-flow valve and then connect that end to the tap at the back of my house, turn both taps on,
that somehow I'm not gonna have pressure somewhere in my house, is that what you're saying..??