1.Product surface after shot peening, effectively removed the internal stresses producted by hot forging, meanwhile improving the appearance of the surface aesthetics. 2.brass keg coupler without safe vale A type polished.Product surface after shot peening, effectively removed the internal stresses producted by hot forging, meanwhile improving the appearance of the surface aesthetics. 3.Product surface after shot peening, effectively removed the internal stresses producted by hot forging, meanwhile improving the appearance of the surface aesthetics. 4. Technical parameters: Body: Brass Operating temperature: 0-100 degree centigrade Operating pressure: 0,5Mpa thread: G5/8 5.Products sealed by natural rubber injection molding, in line with the drinking water standards, will not cause secondary pollution of beer , to keep beer pure hygiene, health security . 6.The shell adopts hot forging process, the internal grains are refined, and the corrosion resistance of the parts is greatly improved.