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By certification 
Feature:
1. Succinct appearance and compact conformation.
2. Because of the special seals, the feature are large flow rate and long lifetime.
3. External pilot, can be used without electrical.
4. If nessarry, you can use the manifold.
5. There are various connection and installation method for manifold. It is easy to use.
6. The manifold of 200\300\400 series have the function of exhaust throttling, so no need to connect another throttle valve.
7. Because of be used external pilot, the working pressure of double air control valve can be zero or vacuum.
