1,Forging base 2,Welding construction 3,Integraltype cylinder 4,Inner safety valve 5,Double seal for the pump YRD17-High-qualityWelding Double Ram Car jack 1.Welding construction no leak 2.High strength forged base 3.Piston rod of the integrated heat treated high strength 4.Double seals in the pump toprevent the oil leak 5.Inner safety valve prevent the user to adjust the systemHow to use:1) Park ...