That may be expensive in that it might be an uncommon valve. Perhaps it would be better to use two valves and 'Y' their outputs together. You may find a solenoid valve you can use in the automotive industry. An EVAP solenoid http://www.amazon.com/ACDelco-214-1685-VALVE-ASM-EVAP-BRACKET/dp/B0049BROCI is one that handles fumes of the fuel system. I recently discovered two valves on a vehicle that I was working on to have variable ports actuated via stepper motors. - Scotty