5/8" O.D. (1/2" I.D.) - With 1/2" FIP ValveCambridge gas connectors are made of durable and corrosion resistant 304 stainless steel to provide extra strength and flexibility. They feature a flared end fitting for secure metal to metal sealing. Ideal for indoor and outdoor use, Cambridge gas connectors are CSA and UL certified for use with natural and LP gas. Gas connectors are great for use with kitchen appliances, gas ranges, and unit heaters.