1/4" NPT Red Latching Mushroom Style Push Button 3 Way, 2 Position Pneumatic Control Mechanical Valve from U.S. Solid: Amazon.com: Industrial & Scientific
China Pneumatic Switch Controller Valves (Fuel Tank Truck Aluminum Pneumatic Control Block Push Button For 2 -6 Compartments Oil Tanker Huate -YOJE-GLME) - China Pneumatic Valve, Pneumatic Control Block