Product Details: The H21 Series Hydraulic Gear Pump with Spline Shaft from Buyers Products is a sturdy, durable bi-rotational pump that can be 2- or 4-bolt mounted in an SAE B mount. The pump is built tough of cast iron with teflon-coated bronze thrust plates. Four internal dowels work to protect its structural integrity. Choose from a range of models with flow rates from 6.8 to 15.3 at 1000 RPM. The pumps are capable of higher pressures, taking up to 2500 or 3000 PSI. All of the models feature a 7/8 in. by 13 spline shaft.