MySit 5.5" Office Chair Gas Lift Cylinder Replacement Parts, Heavy Duty 450lbs Long Stroke Hydraulic Pneumatic Shock Piston Universal Size Fits Most Executive Chairs, Gaming Chair, Class 4

Works as advertised. Pops right in to an office chair base, just like any other gas cylinder. I have one issue, and this is my bad. I'm 6' 2" tall. I assumed the 8" cylinder was for me. Nope. At its lowest setting, it's just a bit too tall for my comfort. So hopefully this helps you pick the appropriate cylinder for you.

Removal of the old cylinder can be done with some lubricant, a hammer, and a pair of channel locks or a pipe wrench. The way I found success was by applying a generous amount of multi purpose silicone based lubricating oil to both sides of the outer cylinder where it seats in the wheel base, as well as where the inner cylinder connects to the actual seat base, and letting that sit for a day with a few paper towels underneath to catch any drips. WD-40 would probably work too, I used silicone based lubricant so it wouldn't damage any plastics though. After it sat for a day or two I held the chair upside down by the wheel base and gave it a few good hard hits right in the center of the bottom of the cylinder with a 2 lb. hammer, and it came free. To separate the inner cylinder from the rest of the chair I placed it upside down on the ground and knocked it side to side a few times with the same hammer, then grabbed the inner cylinder and gave it a twist with the channel locks, which did the trick for that. Remember that channel locks and pipe wrenches only 'grab' going one direction, so if it's slipping go the other way.Do yourself a favor and plug your ears with something. Seriously.New cylinder was a drop in replacement, and so far is working well. Hope this helps someone out there.

I bought a new chair that was just too low to work comfortably.I bought the 8" link cylinder which works great all the way down so it should never fail to hold height or at least I won't care.All the way up makes it a high chair. I'm set if I put a bar in my office.So the first purchase was because I didn't read the specs on my new chair close enough. The second one was to fix the old chair.

Strong with high lift!

Good replacement. Some difficulty on removing from my chairs. Cut, and hammers. Stuck hard. Getting better after number 4.

I needed a replacement cylinder for my older chair but was having a hard time even removing it. First off the tool worked lovely and was infinitely easier then whatever I was doing. My only real complaint is the replacement cylinder it comes with is REALLY high. Like if I put it all the way up I have to actually jump to get on my chair. If I put it all the way down my chair still doesn't fit under my desk. So now I have a working cylinder put I have to sit an extra foot away from my desk, I guess you can't have it all. It was easy to install (and uninstall my old one) 5* there, if you need a cylinder this high it's probably a 5* for you there also. As far as comfort goes I have to rate it a 1* for ME PERSONALLY because I'm gonna have to replace this cylinder it's WAY TOO HIGH. If you're looking for something that goes high though this is the cylinder for you. The tool is also pretty priceless lol

Bought this back in August. Seemed to work well so I bought a second one for another chair. Welp, after only a couple of months this first one has stopped working. It no longer keeps the chair up - constantly drops. I bought this because it was heavy duty and supposed to support a lot more weight than what I weigh. Too late to return it, of course. I use this chair everyday. I will try a different brand (though I think all of these are made at the same factory and sold to different companies). However, first I am going to try to get it out of the base attached to the bottom of the chair. I never could remove the original one (from either chair), no matter how many videos I watched, and how easy they said it was, and trying several different ways it was suggested to have it easily pop out of the base. I ended up having had to buy a whole new bottom piece for both chairs as well. I am now concerned the second one will fail too. I don't use that chair as much (it's in the basement with my craft area) so we'll see. If I can't get it out of the base I'm not sure what I'll do. Buying a new chair would probably be cheaper than constantly having to replace these faulty, poorly made pieces.

I love it.I have a AutoFull racing style chair and it sat about an inch too low for my work surface. This cylinder gave more than enough lift with more available. Changing it out was a job. I beat on it with a dead blow hammer to no avail and ended up unbolting the seat surface and using a pipe wrench on the cylinder to work it back and fourth to loosen it up. Once it broke loose it was a simple task to install the new one and it was well worth the effort. Its worth noting is that this replacement cylinder has more bounce than the original.Just make sure it will fit you're chair and if it fits Id recommend it to you.