The Hydro-Tek 8600900 is a DO3 Valve Manifold Block Adapter Plate that enables the creation of a stand-alone 1 to 3 station DO3 valve manifold. It allows for the parallel connection of one, two, or three DO3 valves, enabling their simultaneous operation. The adapter plate is compatible with both tandem and closed center DO3 valves, depending on the type of hydraulic system. For open center systems, an unloading valve is necessary to serve as the return to tank passage when the valves are inactive.