An instrument includes a chassis having a side adapted to be removably mated with a surgical robotic manipulator arm, a transport shaft coupled to the chassis, a valve including a valve channel and a movable valve member, a first robotic actuation piece, and a manual button. An auxiliary channel is defined in the chassis. A cavity extends through the transport shaft and intersects the auxiliary channel, which define an instrument axis. The valve channel intersects the auxiliary channel. The movable valve member translates across the valve channel along a valve member axis. The first robotic actuation piece is coupled to translate the movable valve member along the valve member axis and rotates about an actuation piece axis perpendicular to and offset from the valve member axis. The manual button is coupled to translate the movable valve member along the valve member axis and translates parallel to the valve member axis.