Dynami Barber Chair Hydraulic Pump,4 Bolt Salon Chair Replacement, 4 Screw Pump Adjustable Height: This is a 4-bolt pump with a height adjustable range of 4.3 inches. You can install it on a chair and adjust it to the appropriate height as needed, which is very practical. Selected Materials: The pump body is made of cast iron, combined with a spray-painted plastic casing, you don't have to worry about it deforming during use, resulting in a longer service life. High Bearing: It can withstand a weight of 440 pounds, letting you rest assured to place a chair on it, and also make people sit at ease. Ergonomic Design: Its design conforms to ergonomics, so you only need to step on the lever to raise or lower the chair without bending over. Easy to Install: You only need to install the lever and plastic cover, and then install the entire lifting pump on the chair you want to lift. Application: This chair hydraulic pump is suitable as a replacement part for most standard-style chairs with four-hole and diagonal hole spacing of 4.53in bases in bars, beauty salon, hair salons, and other places. Note: the The package does not contain the bottom disc and bolts, it needs M6 screws, prepare in advance.