MASTERY MART 9 Inches to 13 Inches Gas Lift Cylinder for Most Office Chair, 4" Stroke, Heavy Duty 1000 lbs, Office Chair Gas Lift Cylinder Replacement, Class 4 (Not for 1KEA, Black)

Works fine, the height is almost a wee bit too high but it is all good. Super easy to install once the old one is out and there lies the problem.Do not underestimate how difficult it is to take out the old piston. I watched numerous YouTube videos, all claiming to have the secret method, and I tried them without success. The side of the piston where the wheels are mounted - a piece of cake, a stroll through the park, etc. The other side, what a challenge. Finally, a young plumber who was working on our bathroom gave it a try with a massively, long pipe wrench. He just barely got it off and that was with two of us holding onto the chair. At the end of the day, it's cheaper to repair than to buy a new chair. But, the next office chair I buy will be fixed in height with no piston.

Easy to fit

Was a good fit, functionally works, but has an issue of lifting it's self to full height over night from time to time, not that much of a big deal.

So I watched a video of a young woman giving a gentle twist and tap and out comes the old gas lift cylinder and all in 30 seconds. The reality is the cylinders can be devilishly difficult to remove so be prepared for using a bit of brute force and a lot of swearing. After eventually removing the top end from the chair with a pipe wrench and lashings of wd40. It took several hefty blows with a lump hammer to remove the casters end. That said the replacement seems of good quality and will add a few more years of use to a perfectly serviceable chair.

amazing gas lift, if you want to enjoy silence and pleasant use, then this is your option, but I realized this after two days, let's see how it will show itself over the next month

The 5 inch model is spot on at its lowest point

as described

I bought this replacement gas cylinder after my original one began to fail before xmas. After a lot of hammering and applying some WD-40, I was eventually able to remove the old cylinder from my chair then quickly attach the new cylinder.I decided to go for the extra long cylinder being a tall person, thinking the extra inches would allow me to sit at an more optimal level as opposed to the standard length of cylinder which felt too low, even at its highest point.. and my thinking was correct, also the cylinder supports up to 250kg which is more than ideal for me, being on the larger size (6ft 3 in - 200kg+).So far. the cylinder feels sturdy and solid and would recommend to anyone in the same position as myself