The ornamental design for an actuatorknob for rod and tube assembly, as shown and described.
FIG. 1 is an isometric top view of an actuator knob for rod and tube assembly;
FIG. 2 is an isometric bottom view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a right side view thereof;
FIG. 8 is a left side view thereof; and,
FIG. 9 is a right side view thereof shown in an alternate position.
The broken line showing of the actuator knob for rod and tube assembly is for the purpose of illustrating portions of the actuator knob for rod and tube assembly and forms no part of the claimed design.