LEGO Compatible Pneumatic Solenoid Valve See picture at: (URL) Valve Specifications: 3-way valve (in, cylinder, and exhaust) 7 watt 6-12volt DC (power output from RCX Brick or motor power pack will actuate) 20-25 pumps max pressure (rating based on (...) (25 years ago, 5-Feb-00, to lugnet.robotics, lugnet.market.buy-sell-trade)