Western Enterprises Quick Connects Brass construction provides long service life. Non-interchangeable oxygen and fuel gas connectors. Instant closure on reverse flow check valves. Spring-loaded locking mechanism responds to fingertip action and achieves a gas-tight connection. Double seal socket connection on second seal Pack of 1 WARNING: This product can expose you to Lead, a chemical known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov - Lead