his Kit includes a Manual Relief Valve and Coil Upgrade for KTI Hydraulic Pumps. It is used for Power Up/Power Down Hydraulic Systems (will not work with Power UP/Gravity Down). It allows Gravity down function via pressure relief screw on the down valve in case of dead battery or to save battery life. Great replacement for dump trailers. Fits Load trail, Top Hat, Maxx-D, PJ, Diamond C, Sure-Trac and more.