Subplates are unfitted hydraulic manifolds and are used as base plates for accommodating hydraulic directional control valves with valve pattern CETOP3, CETOP5 or larger, based on ISO 4401. In this way, directional control valves and sandwich plates of sizes NG06, NG10 and larger can be assembled. In addition to single valve subplates (type G), manifolds (type HSR) offer the possibility of building up a parallel 2-way, 3-way up to 10-way control system. In addition, multiple connection plates offer additional functionalities, such as integrated measuring ports or an integrated pressure relief valve (type DBD).