9 Inches to 13 Inches Office Chair Cylinder Replacement, 4" Stroke, Heavy Duty 1000lbs, Hydraulic Pneumatic Shock Piston, Universal Gas Cylinder Fit for Most Office Chairs, Class 4, Black

So far…so good. I’ve had many problems with these things in the past - because I’m 6’2”/ 225lbs - so time will tell. However, I KNOW this one will last (I got the longest model) because even when it’s collapsed it’s at just the right height - which is fine for me.BTW: Have a large hammer ready to know the old one out of the base - and a pipe wrench that you grip the upper portion with. I had to use the hammer on the wrench handle (in both directions) to loosen the upper portion where it press-fits into the chair. That’s the tough part. Both ends are press-fit. And leave the little clip at the bottom alone. It doesn’t need to come off.

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.

Fixed an old office chair I bought from work in an auction. Chair is probably over 15 years old. The old cylinder would no longer stay at the higher setting. The chair would sink. I put hose clamps to try to lock it in place but they broke and the upper cylinder would wobble in the lower cylinder. I bought a new base and cylinder from the mfg. but is was too short. My knees were up in the air. The chair is upholstered and a little stained which would clean up if I wanted to spend time on it. I have only had the new cylinder a day but the height and range of height adjustments are perfect. I am 6’3” and the rest of my family are short. Works for everyone.While it is not a new ergonomic chair with 20 adjustments, it is very comfortable. I am hoping to see the chair last another 10 years.

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

This is really a high lift. I'm 6'4" and with the lift all the way up my feet are about 2" off the floor. Plenty of room for adjustment. A good purchase.

I used this to replace my gas cylinder in my chair (which was quite difficult, but I wouldn't say that was the fault of this product so much as just that it's hard to get cylinders in and out of chairs). This cylinder doesn't work. It keeps raising the chair when I'm not sitting in it, then sinks to the bottom setting when I do sit in it. No matter what I do, I can't get it to stay down when I'm not sitting in it, and I can't get it to stay up when I am sitting in it.For the record, this listing says it's rated for 450lbs, and I weigh less than half that, so this isn't a case of me misreading the product's capabilities. Amazon requires you return the package to get a replacement or a refund, and since I'm lacking in transportation at the moment, I'm not in a position where I can pack this thing up and send it back, nor am I eager to get another one when this first one failed so badly and was so difficult to install.Do yourself a favor: DO NOT get this cylinder.

Works as advertised

Installation is easy, and it works perfectly so far, though I’ve seen reviews that say it doesn’t last longer than 3-8 months.