You are buying one (1) Interface Devices Inc. intensifier pump model TASQ-05-RG-080 SC-0-B-AB hydraulic over pneumatic with a 5:1 ratio. It has a HYVAIR model D03A-2B-35 pneumatic valve. If you put 100 pounds of air in this device, you will get 500 pounds of hydraulic pressure out. The hydraulic gauge registers 1000 PSI. It is complete with a regulator. It was purchased for a prototype machine but was never used. It is new but has been on shelf awhile. The pump cost over $1000 and the valve around $300. I have two available.