OPEN PORTABLE OXYGEN TANKS EASILY - Designed for use on portable oxygen tanks, allows the user to easily open and close the tanks used in oxygen therapy. An essential tool for anyone involved in oxygen therapy. DURABLE OXYGEN WRENCH - Unlike other wrenches / keys that are made of plastic, our heavy duty wrench is made entirely of metal. The strong and durable construction means it won't break or deform when opening and closing oxygen tanks. CGA 870 COMPATIBLE - Designed to fit adjustment stem on all CGA 870 standard post valves for 'D' and 'E' sized medical oxygen cylinders. 05" CABLE INCLUDED - Never lose your wrench again. Simply attach the cable to your oxygen regulator screw to always have this important took on hand. › See more product details