HIGH PRESSURE BALL VALVE
I'm for the ball valve every time. Simply click a ball valve on the end of your pressure hose and you can save a lot of work. Ball valves come as a kit, complete with quick connectors, so they are easy to put on and off and can be installed anywhere along the line.
Ball valves are a little heavy, so there is a small price to be paid if you lug one around all day but for those times when changing tools back and forth regularly they are simply the best!