STRAIGHT JOYSTICK HANDLE Brand new, PRINCE part number 660190017 straight joystick handle for use with PRINCE SV stack valves. Allows one lever to control two different work sections. Right/left controls one work section, forward/backward controls the second section. The spools can be operated independently or simultaneously. Spools being controlled must be adjacent to one another. If two joysticks are installed on one stack valve, it is recommended that there be two standard work sections between them to prevent handle interference.