Two-way valves turn air on and off in applications such as shop air, branch airlines, supply pressure to systems, and supply air to tools, motors and similar equipment . Two-way valves can also be used as vent valves. Normally closed, 2-way valves block inlet flow when in the UN actuated position. Features: The air control valve only needs low pressure to be activated It has a blockage single and double action control multi structures. Which already widely used in food  medical detergent petrochemical coating vehicle mechanical equipment, and so on. Package includes: 1 x Air Control Two Way Valves Q22HD-DN25