This single-stage trolley jack is operated via an air compressor The Sealey YAJ201 trolley jack has a 20 tonne capacity and is ideal for workshop or roadside use. It is powerful and reliable, taking the effort out of lifting heavy plants, tractors and commercial vehicles. This model will require a compressor of above 3hp. Features: Powerful and reliable, ideal for workshop or roadside use At modest cost, it takes the effort out of lifting heavy plants, tractors and commercial vehicles Supplied with 20mm, 50mm & 100mm extensions This jack will require a compressor of above 3hp Specification:  Maximum Capacity: 20 tonne  Minimum Height: 215mm  Maximum Height (inc. Extension)/Capacity: Stage 1 (mm/tonne): 456/20  Piston Stroke: 141mm  Screw Extension: -  Extensions: 20/50/100mm  Chassis Length: 525mm  Length including Handle: 1765mm  Width without Wheels: 133mm  Overall Width: 265mm  Air Consumption: 10.5cfm  Working Pressure: 116-174psi  Weight: 30kg