Sign up for our Newsletter. Tall Height Heavy Duty XL Air Lift Technician Stool. Heavy Duty XL Air Lift Technician Stool with a 400 lb weight capacity. All while being stylish, durable, and comfortable. The generous 18.75 diameter seat is 3 inches thick to provide maximum comfort. The black PVC Leather is easy to care for and stylish cross-hatch stitching adds a touch of class. The durable chrome coated extra-wide welded steel base has heavy duty steel & rubber casters for smooth mobility. The easy-glide pneumatic gas-lift pump allows you to set the height of the stool ...