Review on MySit 5.5" Office Chair Gas Lift Cylinder Heavy Duty Replacement Parts - 450Lbs Long Stroke Hydraulic Pneumatic Shock Piston Universal Size Fits Most Executive Chairs, Gaming Chair, Class 4 by Liz Lee

Item was delivered quickly and was an easy install with the right tools. Using a wood or rubber mallet and an adjustable pipe wrench, the swap out was like 3 minutes. For those trying to remove the old cylinder. Put the chair on is side, hold onto the leg and hit the bottom of the old cylinder with a rubber/wooden mallet. It may take a few good hard whacks but the floor portion should pop off. Next using the pipe wrench, grab close to where the cylinder meets the seat and turn either direction while pulling it away with your free hand. Having a second set of hands does help. Then replace with new cylinder and off you go.