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)

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.

My office chair turned out to be a disappointment after the backrest wouldn't stay up due to the plastic turn knob not staying tight no matter what I did. Then when my chair started to lose its lift on a regular basis I thought I would have to buy a new chair. I would sit down at my desk and realize I was sitting at the same height as a child does. Sad, because my previous chair lasted about 18 years. When I discovered this gas lift cylinder replacement I thought it would be worth a try to mitigate the expense of a new chair. I took the measurements from my chair in regards to how far it lifted from where it bottomed out to where it extended to and determined the 4.5" stroke height was the one I needed. I didn't know what "stroke height" was but I figured it out. Once I received it, I needed to remove the old cylinder, which was the HARDEST part of the task. I removed one end with a few hardy smacks with a hammer as illustrated on YouTube. Additionally, after unsuccessfully removing the other end with a pipe wrench as instructed, I had to disassemble the chair's mechanism to dislodge the end of it that was completely stuck in the chair pan. It took some creativity to get it done, but after about an hour of trial and error I got the old one out. At that point installing this new cylinder was SUPER easy. It fit exactly like it was supposed to. The chair is fixed! And I even fixed the other problem of the backrest not staying in position after seeing a fix on YouTube while looking at videos for installing a new chair cylinder. Now my chair is actually better than it was to begin with. The chair is stable and raises and lowers well. I look forward to an uplifting experience from this point forward (pun intended). I would recommend this fix to anyone who wants to save $150-$200+ on a new chair.

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.

Cylinder fit perfect to existing desk chair. Modified to use with drafting table with addition of purchased foot rest. New chair works great as desk chair or drafting chair.

Installation is simple and straightforward. To get the piston out of the chair seat, I used a vice grip and a mallet to loosen the fit and twist it loose. I found it easer to fit the new piston into the chair seet befor setting the cilender into the hole in the chaie base.

Perfect. Easy to install.Instructions are understandable. I did this myself and I’m a female in my late 70’s.

Excellent! It helped me not to replace the whole chair!

as someone who is 6'6" tall my office chair has NEVER been amazing. I Put in the 11 inch piston with the 5" stroke and I'm honestly amazed.. For the first time since grammar school i can sit in a chair and my feet don't touch the ground if i expand it all the way up. truly, for someone with back problems(Former paratrooper) having my knees at the right angle and my feet flat on the ground. its unreal how much better my back feels already. easy install, pop old one out with a dead blow or sledge hammer. if the piston sticks inside the area below the seat spray some PB blaster in where it connects then spin it with a 12" pipe wrench. as soon as it starts spinning it should slide right out easily.I will update late if things go bad. an hour in and i am quite happy.NOTE: I did also add the lifelong black rubberized casters. id imagine those also raised the chair about 2"

Es funcional, es lo que requeria

Fits perfectly!

Sehr gute Qualität, schnell geliefert ! ... hat genau gepasst !

We may have used this in a more unconventional way, but it worked out great. In a struggle to find a comfortable drafting chair for a radio job, we opted to purchase an office chair and replace the piston with this one.It worked perfectly. The chair now goes up way higher and it is very stable. It fit perfectly to replace the piston that came with the original office chair.

Very well made. Super sturdy.