Herman Miller Aeron Chair Gas Lift Cylinder Replacement Heavy Duty Parts. Find the perfect replacement gas lift cylinder for your Herman Miller Aeron Chair with our heavy-duty, premium-grade steel replacement parts. Our cylinder is designed for reliable and durable use, with a maximum capacity of up to 380 lbs. Only for Herman Miller Aeron office chairs manufactured between 1996 and 2012. Top-activated gas lift cylinder for smooth and silent operation. Made from premium-grade steel with a maximum capacity of up to 380 lbs. Perfectly suited fit for Herman Miller Aeron Chair. Passed over 100,000 rigorous tests for unmatched durability. Easy installation, no need to spend hours removing the old hydraulic Gas cylinder. Why You’ll Love It. Our heavy-duty gas lift cylinder replacement is the perfect solution for your Herman Miller Aeron Chair. With its premium-grade steel construction and maximum capacity of up to 380 lbs, you can enjoy reliable and durable use without worrying about noise or wear and tear. The easy installation process saves you time and hassle, making it a convenient and stress-free solution for your office chair needs.