Color classification: CP-700D CP-800 CP-800-1 Product details: All-copper interface, all-copper build, high durability, longer service life; Return oil switch: tighten the return oil valve clockwise when working, loosen the return oil valve counterclockwise when relieving pressure; Hydraulic pump body, beautiful and durable, smooth surface, good sealing; Ventilation nut, with switch indication at the end, must be loosened when in use; Optional pressure gauge, according to customer demand, additional seismic pressure gauge, at any time to observe the pressure change