This reverse flow check valve from Western Enterprises is specifically designed for oxygen applications, featuring a B-size RH male connection. Engineered to ensure safety and reliability in gas delivery systems, this valve effectively prevents backflow, making it an essential component for welding and gas equipment setups. Please be aware that this product may expose you to lead, a substance known to the State of California to cause birth defects or reproductive harm; for further details, please refer to www.P65Warnings.ca.gov.