11 Inches-17 Inches Office Chair Gas Lift Cylinder Replacement, Tall Chair Cylinder 5.5" Stroke, Hydraulic Pneumatic Shock Piston, Heavy Duty 1000lbs, Fit for Most Office Chairs, BIFMA/Class 4 (Black)

The media could not be loaded. Fits perfectly on my Aeron fully loaded size B chair. Assembly was not difficult if you have a medium/large sized pipe wrench. (If you’re not worried about damaging the top portion of the cartridge) There’s some good R&R videos online. To remove the bottom portion takes a hammer. (Eye and ear protection might be necessary) My wheel platform is aluminum, so warming it up with a little heat helped releasing it easily. Both top and bottom are held in place using a taper. The cartridge fit perfectly. (Top activated) Smooth action, made sturdy, and looks good. Raises the chair perfectly for a 35” desk.

Works great!Just buy it, you know you need it.

I work from home and have a tall desk so I can periodically stand while I work. This extender is perfect to raise my chair to the Goldilocks height!! The original part is very hard to remove. I had to have my son do it for me because I just couldn’t get it. So you will need someone strong to help you with this endeavor. It’s worth it. No wobbles. Works perfectly.

I am so happy that I bought this taller lift! I bought an expensive executive chair from a box store, and the OEM lift failed rather quickly. The employees at the box store have apparently been trained wrong as they said the parts were not replaceable.After some research I settled on this longer lift. I am 6'3" and my chair was always too low even at max lift. This new piston is MUCH taller.If I have the lift at max height then I have to literally hop up onto the chair, and my feet dangle. But I can rest my feet on the chair base and be very comfortable. I can lower the chair to a height where my feet are flat on the floor and I'm still higher than a "normal" chair. So this is perfect for me. But if you are shorter than 6' you may want to get a shorter lift.Tip for removal of the old piston is to buy/borrow a dead blow hammer. The original piston wouldn't budget with a pipe wrench, mallet, or 13oz hammer. But it popped out after two or three knocks with the dead blow peen hammer on the base.Pros:- Taller height is great for taller people- Lift and chair spin are very smoothCons:- Even at the lowest height this lift piston may be too tall for shorter users

I wanted to turn a really nice office chair into a counter stool for my mother. I realized that I needed to convert the wheels to stationary chair guides, and to buy a new gas cylinder that increased the max height of the chair.I actually did some measurements prior to purchasing this. Most office chairs have a maximum height of around 21-22 inches. My chair had a max height of 23.5 inches, but I still needed higher. And I later learned that I would need to account for the "plushiness" of the cushion, compared to a firmer bar stool type chair, as the cushion would sink in an inch after you were sitting in it.I was weary about how long these things last, so I tried to buy the exact size where the minimum setting was high enough to not require it to be lifted at all. So I originally bought the 8 inch lift gas cylinder. At it's minimum height, this made the chair like 27 inches high, which was too high for my needs.I ended up exchanging the 8 inch one for this 4 inch gas lift that was slightly too short, but only required a tiny bit of lift. And for the price these cost, I'm no longer worried about them not lasting for years. I can just buy another one.Installation was easy, because it was a relatively new chair. I recommend you take the wheel base off first. So place your chair probably head down, ideally on some carpet, fully exposing all wheels in the air. Then get a rubber mallet and hit against the gas lift bottom while pulling on the wheel base, and eventually the base will come off. Then get a pipe wrench or some kind of wrench with a wide enough opening, and turn it the lift cylinder to the left. Mine came off relatively easily. The whole process probably took less than 5 minutes which surprised me cuz some people say it takes like an hour of banging.My original chair piston was not broken, so I wanted to preserve it the best I could. Some say you can protect it from scratches if you put like a rag in between, but in my opinion, that's not feasible because it'll just cause the wrench to spin. I removed the old piston the best I could, but there are pipe wrench marks on it. I wanted to keep it because not only is it still good, but if I ever wanted to turn it back into a regular chair I could.Only had it about a couple of weeks, but so far so good. You're apparently suppose to go up and down on the cylinder every week or so to keep the piston lubed, but I've never done that, and most people probably don't once they find the ideal height. But that's what you're suppose to do for maintenance.I'll reiterate that I do believe this may make your chair taller than it was before on it's lowest setting, and has the range to make it much taller (drafting chair height) if desired. I've never had an issue with these before, because I always sit at the lowest setting which is around 17 inches on most chairs.

It worked for my new office chair to give an extra height for my 34" height desk. :)

Absolutely terrible. My old one that slowly depressed was better than the new one. Installed correctly and the chair that slowly depressed over a few minutes now will not even stay up!The part fits perfectly in chair, but the gas cylinder will not stay engaged.I would highly recommend staying away from this product.

Why did you pick this product vs others?:Good description of product and guidance on how to select the right one for our chair