[John L Williams]

If you had your Headhunter pump on... and hooked to City water, you have a switch to hit to change it over to city... You can hear the valve operate when you hit the switch. If you had the Headhunter on...it would not work with the City water valve on, because the City valve shuts the water supply off to the Headhunter, and it would run dry, and start a clicking sound.