Brand Hydraulics Log Splitter Valve, Model# PLS755T4JRSH [Misc.] Relief valve adjustable to 3500 PSI, preset at 2000 PSI Flow rating up to 18 GPM Tandem center spool action is spring center/hydraulic kickout 4-way directional control internal adjustable relief 3/4in NPT inlet and outlet ports 1/2in NPT work port