Abstract: In one illustrative embodiment, the ball inserter device comprises, among other things, a body having a ball insertion opening and a ball drop opening, wherein the ball drop opening intersects the ball insertion opening, a ball inserter piston that is attached to the body and an inserter cavity isolation valve coupled to the body wherein the valve element, when closed, blocks the ball insertion opening and partially defines an insertion cavity between the inserter cavity isolation valve and the ball inserter piston and a pressure relief valve coupled to the body that is in fluid communication with the insertion cavity. In this example, the device also comprises a ball input device coupled to the body that includes a plug, a removable cap and an opening that is axially aligned with the ball drop opening.