Abstract: A two-piece tool changing device is described. The changing device includes a base and a plate that nests with the base. The base includes a body along with guide brackets and a manifold attached to, or defined within, the base at a point along the peripheral edge of the base. The plate includes shoulders that reversible engage with the guide brackets. A standing section extends from the manifold toward the guide brackets, and defines a channel between the standing section and the body. A spring-biased plunger is optionally disposed within an aperture in the standing section, and the spring plunger is movable between a first position extending into the channel and a second position withdrawn from the channel. At least one conduit is optionally defined in the manifold and a corresponding conduit is defined in the plate, such that the conduit in the manifold and the conduit in the plate are in registration when the plate is nested in the base.