From the Flow-rite website, you needs: RK1 - System 1 Actuator - OPEN - CLOSED CC-xx - Control Cable, 'xx'ft V1 - Valve, System 1 - Barbed here is a topic from awhile back, just to give you some ideas: http://www.wakeworld.com/MB/Discus/messages/65921/198705.html?1100799866