Dynarex Resp-O2™ Oxygen Cylinder Wrenches are sturdy, top-grade devices designed to open and close the valves of CGA-870-style cylinders. This easy-to-carry tool is portable and perfect for travel. The Dynarex Resp-O2™ Oxygen Cylinder Wrench is made from strong, sturdy nylon plastic for enduring performance you can rely on. The wrench features a sleek, compact design that makes adjustments easy, minimizing your exertion and minimizing wear and tear on your hands. 25/CS