What is the size and material of the pneumatic connections?

Bare actuators: the customer will directly connect the air supply to the actuator flange port, size as per customer request.
Actuator with control panel: the customer will connect the air supply to the first item on the actuator control panel, which will be the filter regulator in most cases. Thus the inlet port will be exactly the filter regulating one, whose size will be in accordance to the requested actuator operating time for the air action and whose material will be in accordance with customer specification. Upon request/need, an adapter fitting in stainless steel and in the requested size can be installed on the filter regulator inlet port.