OTTO PLP Head Valve Plate (valve plate) for Hitachi UH07 / UH07-7 / UH083 Excavator - the head valve at the rear of the rotating group in the HPV125B main pump, supplied as Handok Hydraulic (Korea) part 066730. The lapped running face seals the piston group against the intake and delivery ports, so a scored or stepped plate costs flow and heats the oil. Renew it together with the pistons and shoes to bring main pressure back to specification. Inspected before shipment, 3-12 months warranty options.