I finally found one
I had been looking for a hose sprayer to attach to a particular faucet and stay there.  This is it.  My only complaint is that it didn't last as long as I would like.  It came apart.  Maybe this one will last longer.  Then too maybe the water I was using was too hot.  I not only was using it to wash my hair (primary use), but also for cleaning in the laundry tub.  This is when the water got really hot.  So be careful with the water temperature.  Otherwise, I am not totally dissatisfied with it.  I have bought three of them.
Rating: 4 stars