Hollow Hydraulic Jacks Hollow Hydraulic Cylinders Electric Split Jacks Smooth and corrosion-resistant paint finish for added aesthetics Hydraulic support port Two sections of the shaft center, a section to promote a rise in the reasonable distribution of the support with the heart, the spindle has an automatic retraction function Quick coupling + plastic dust cover The connector adopts threaded ZG3/8” quick coupling, thread locking, compact structure.