DOZYANT 6" Long Stroke Office Chair Gas Lift Cylinder Replacement,Hydraulic Pneumatic Shock Piston Heavy Duty (450 lbs) for Tall Person Universal Size Fits Most Executive Chairs, Highest End Class 4

This is the second Dozyant 6" gas cylinder I've purchased, and it fit just as well as the first one.I have a Hyken Ergonomic Mesh Swivel Task Chair bought back in 2017. The original cylinder lasted until April 2021. Purchased a Dozyant 6" cylinder as a replacement. It fit perfectly and worked just as well as the original.The first Dozyant cylinder started to fail in Feb 2025, so I purchased the same make/model.Removal of the old Dozyant was a bit of trouble: the pipe wrench method did not work. Used spray lubricant where the cylinder inserts into the seat mechanism, let it sit for 30 min. Held the cylinder in one hand and applied 8-9 good hits on the seat mechanism with a 4 lb sledge hammer, which did the trick.Applied a thin layer of anti-seize to the hole in the seat mechanism where the top of the cylinder inserts. Hopefully, that will make it easier to remove in several years.The new cylinder fit perfectly, and the chair works as expected. Happy customer!

I got a new office chair for my adjustable standing desk. Only problem was that the chair didn't go high enough to accommodate my legs and the desk didn't quite come low enough. It was a snap (for hubby, not me!) to take the original out of the chair and pop this one in. Now I can raise my chair even higher, and the chair works with the desk. Very happy.

My B009ZNEUOA HON Lota Mid-Back Work Chair from 2012 started sinking this year. By August the cylinder would no longer hold any height. Rest of the chair had been holding up for seven years through multiple moves so I wasn’t about to replace it all. I put up with the low seating until my neck and my hands started to complain. Okay, okay—time to swap out the cylinder instead of a whole new chair.The cylinder is packed in a plain brown box with no instructions or anything. It is mislabeled for the five-inch model but the Amazon customer questions show that this is indeed the six-inch job. That’s it—pull it out of the box and you only have everything else to do.Installing the new cylinder was easy. Only tricky part about that was lining the seat up with the post so the base plate would slip right over—took about a minute. It was getting the old cylinder out that took me more than an hour, if you count the trip into town for a wrench. Right away you will need the right tools for the job:1. Pipe wrench with at least 14-inch handle.2. Two or more clamps.3. A work table or similarly study clamping station.4. B000F09CF4 Kroil, the oil that creeps! 5. A good metal hammer.The basic process is to pop the clip off the bottom of the old cylinder. This will allow the wheelbase and the bottom casing of the cylinder to separate from the rest of the chair. Some washers fell out of the bottom and the piston stuck out of the cylinder itself.Next, I had to remove the tilting base plate from the bottom of the seat. I had to do this after spending ten minutes trying to wrench the damn cylinder loose and only making gashes in the metal. For my Lota chair, I undid four hex bolts with a 3/16 hex wrench and pulled the plate clean off. Easy peasy.Then I added into the socket of the base plate some Kroil, the oil that creeps! Boy was that stuff slippery. The socket and cylinder were so tight I am not even sure the Kroil crept in there much.After that I clamped the plate down to a work table with a pair of strong C-clamps. It took a few minutes of adjustment to get them in place enough to keep the plate from twisting off the edge of the table.From there I ran into town and bought a 14-inch pipe wrench from Lowe’s. An extra 14 bucks. I recommend getting an even longer one for the leverage. Once clamped on, the wrench will slide one direction and dig in when pulled the other way. Pull with both hands, with all your might, in the biting direction.Just when you think that sucker isn’t going to come loose, be pleasantly relieved when the cylinder twists right out in one motion.At last, you’ll need to clamp your wheel base down and tap out the old cylinder bottom. In my case, the bottom was flush with the barrel of the base, so I couldn’t use a wide-face mallet, while my small rubber mallet was just too darn light. Finally, I took a good old fashioned steel hammer and with careful aim knocked it out in about six hard whacks.The finishing touch, before reassembling the whole chair with the new cylinder, was to add swap the original casters for rollerblade-style B01CTIG4GE Heavy Duty Caster Wheels from Office Oasis, an office aftermarket supplier. They came five to a pack and roll more smoothly and swiftly than the OEM wheels.For final assembly, the new cylinder dropped into the wheel base nice as you please. Don’t forget to pull the purple safety cap off the top! This exposes the plunger that the chair base plate will tap whenever you pull the lever.Day one at least, my chair works immediately well with the new cylinder. Without sitting on the seat, I depressed the lever and let the chair raise to its full height. Now I sat down and adjusted down so my feet were just touching. This put my hands and my head at a more ergo-friendly posture.Overall I think it is a good idea, when you are replacing the cylinder, to go head and consider upgrading the casters, possibly even the whole wheelbase. Maybe get some coverings for the stems of the base as well to protect them from being marred by your shows and to help you lift off.

These office chairs are often found out for the trash because the lift cylinders DO wear out. I am sure landfills are full of these only for that reason. I found a chair that I really liked but of course the lift was shot. There are several short YT vids showing how to replace but it does take a lot of force, BUT it is fast and easy to do.I am tall and thin, so don't have much "padding" in the seat. I took the chair completely apart. Reupholstered the chair to suit me. Additional padding need not be thick but HIGH density.Also the plastic parts looked ratty, so I did sand areas and used rustoleum for plastic to repaint. Prep with a green scrubby and wipe with a solvent before spraying the paint.If you overlook my not-so- great box cushion with piping, the chair works and looks new.So 25 + paint and fabric for a custom chair, I feel was worth the work.Only 4/5 because the cylinder is "for tall people", but average height. Still high enough for 6'-5".

heavy duty, taller and better than original gas cylinder. Yes, you need to "wail" on the old one to get it off!