Heavy Duty Gas Lift Cylinder for Herman Miller Aeron Chair 4 Hydraulic Piston with 380 lbs, Office Chair Gas Lift Cylinder. SHS Office Chair Gas lift cylinder? Only for Herman Miller Aeron office chairs manufactured between 1996 and 2012 – Top-activated gas lift cylinder (please confirm your model before placing an order). QUALITY? Made from -grade steel, with a max capacity of up to 380 lbs, for Herman Miller Aeron Chair Made of high quality alloy steel material, our Seat Air Lifter Cylinder is reliable and durable to minimize the need for, even when rotating or lounging in the chair, without making noise to your colleagues. EXCELLENT ALTERNATIVE PARTS? Our pneumatic cylinders are perfectly suited fit for Herman Miller Aeron use, no noise, 360°silent rotation, aerodynamic impact, simple and smooth operation. HEAVY DUTY CLASS 4 PISTON CHAIR? Fit for Herman Miller Aeron Pneumatic Gas Cylinder that has passed over 100,000 rigorous tests. It can withstand up to 380 pounds of weight and offers unmatched durability! EASY INSTALLATION? Instead of spending hours removing the old hydraulic Gas cylinder from your chair, you can simply remove the broken piston and easily install our chair pneumatic lifters, saving you time!