Welcome to TBN, Ray. As far as your petcock, I don't know Branson. An owners' manual should answer your question. I do know that most water valves are turned so they align with flow to turn on or go across the direction of flow to turn off. My old Mitsubishi tractor was the opposite. The handle was turned across the flow to turn it on and in line with the flow to turn it off. You can try cracking a line after the valve to see how it works.