Different with similar hand tool that relies on leverage and hand power, our hydraulic copper tube fittings crimping tool is designed with hydraulic cylinder which is labor-saving. 1 person is totally enough to finish leak-free connections. With a ball bearing springs inside the head, just simply slide in and out to change the crimping dies of different size It takes only a few pumps to get the fitting compressed in seconds. The body made of aluinum alloy,Effectively prevent oil leakage Suit for Narrow Space,Small Fitting., Manufacturer: MNMIOIO