2 Position 5 Port Air-Control Valve (Blue) (each).

This valve is for use with all pneumatic-operated (air) retractable landing gear, and it controls air flow to retract or extend air cylinders. It can be used to operate tricycle landing-gear systems. A double O-ring seals in a burnished i.d. for no-leak operation and lifetime lubrication.
The operating valve requires approximate 1/4" of push rod travel and functions with standard or mini servos.