The Hydraulic Valve from Buyers Products is built to be tough and reliable for heavy duty dump truck hydraulic operations. It's rated at 35 GPM. The 3-position, 3-way valve is pneumatically controlled (can also be shifted by handle, see "Accessories" below). It easily installs with 1 in. NPT inlet work ports and a 1-1/4 NPT return to tank. The relief valve is preset at a maximum allowable 2000 PSI .