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Rexroth, Festo, SMC etc etc will sell you modular components allowing you to make up these "switches".
Need to remember that the "switches" are unlikely to have large air flow capacity so they may be too slow for your needs.
These type of devices are often used in the control section of a pneumatic circuit controlling other devices - for example a pneumatically actuated Directional Control Valve.
No electrical power is required.
( usual disclaimers )
It seemed like a much better idea when I started it than it does now.