This Ball Lock Gas Fitting is threaded so you can attach a barbed swivel nut to the fitting along with the appropriate sized tubing. This ball lock fitting works well with 5/16" gas tubing because you get a much tighter connection using the barbed swivel nut. Keep in mind that gray is for gas. The materical is ABS plastic, We export large quantity to USA, Europen and Australia countries, deal to high quality and reasonable price. We are ready to refer you our favourable price and relative samples, for quality evaluation and marketing activities.
