TP30K-ZN High Pressure Hydraulic Tensioner Pump Key Features: Air driven Diaphragm pump with single air head, 1:220 ratio. Oil level gauge, oil return valve. Bracket for outlet support. 2 gallon stainless steel oil reservoir. Calibrated 30,000 psi – 4-inch diameter outlet pressure gauge. Air regulator, filter and pressure gauge. Aluminum frame with lifting handles and cover.