CrownFLEX-CG5 Series Coated Stainless Steel Connector - Range Gas Connector 5/8″ O.D. (1/2″I.D.) Tube Size Industry Standard Yellow Polymer Coated – Provides protection against accidental contact with common household cleaning products, ammonia, chlorine, solder flux, and muriatic acids. It also protects against UV rays and salt spray. This coated stainless steel connector is available in several lengths with a variety of end fittings.