Built from a reliable metal to ensure no leaks Designed for WE Tech magazines but can fit in some other magazines Features an O-ring that's already on the valve Makes as a great upgrade or replacement part for in cases you have a leak or an O-ring is cracked In the Box 1X Valve 1X O-ring Specifications: Brand WE Tech Build Metal Material Propellant Green Gas Compatibility Designed for WE Tech Magazines California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov