How many connection ports does the body of a single acting cylinder have?

A single acting cylinder has one connection port for its operation. This port is used for supplying compressed air to one side of the piston, creating movement in a single direction. The force generated moves the piston, while the return stroke is accomplished by a spring or by the load's weight. This design reflects the simplicity and efficiency in applications where only one directional movement is needed.

In contrast, options that suggest more than one port typically pertain to double acting cylinders, which require separate ports for both extending and retracting the piston. The absence of ports in other options does not align with the operational requirements of a single acting cylinder. Thus, the identification of one connection port accurately describes the functional characteristics of this type of cylinder.