Hydraulic Control Valve MK3 Pump Replacement Square Shaft - Sparex Part S.4785The Sparex S. 4785 Hydraulic Control Valve is a precision engineered replacement designed to regulate hydraulic pressure and flow in agricultural machinery. It ensures smooth and consistent operation of lift and auxiliary functions, delivering the reliability needed in demanding field environments. This valve is built to suit MK3 hydraulic pumps with a later square type shaft and can replace earlier round shaft versions with minimal modification.