needle valve,made of forged stainless steel,high pressure and high airproof, precise making,easy to install,reliable quality. Features:1. Design & Manufacture According to: GB/T 12224-1989 , JB/T 7747-1995,ANSI,ASTM...2. Connection: male thread,or butt welding.3. Structure Characteristic: awl seals; Movable Disc.4. Test: GB/T 13927-1992,API598...5. Material:forged Carbon steel:GB/T 12228-1989, ...