This Enerpac MZ-4002 extension tube is used with MS-series hydraulic cylinders using the MZ-4013 lock pin (sold separately) and has a 2.5-ton capacity. It is 3" in length and has 3/4"-14 male National Pipe Thread Taper (NPT) connection on both ends.Enerpac manufactures high-pressure tools and equipment for industrial applications. The company, founded in 1910, is headquartered in Menomonee Falls, WI.