It's PTO Driven Booster Unit for operating hydraulic driven planters, vacuum fans, etc., while still using older tractors with lower numbered hydraulic hookups and lower hydraulic pressure. Mounting bracket was purchased for 7140 Case, but other mounting brackets can be purchased for other models or makes of tractors. Runs off a big 1000 RPM PTO. Unit has a 15.0 gallon oil tank, cooler, filter. Unit is about 14 years old, but in good shape. Always was stored inside when not being used.