Main Control Valve: 2-Spool, open center series parallel configuration | Auxiliary Control Valve: 2-Spool, open center series parallel configuration | Hose Quick Couplers: 2 Sets of Quick Couplers: 2 Sets of Quick Couplers: Set 1 -2 quick couplers to drive an attachment with cylinder(s). Set 2 – 3 quick couplers to drive an attachment with hydraulic flow return.