... 2,Quick delivery 3,Oem ,Odm Accept 4,Produce by international standard Brass ball valve Brass ball valve: 1,Size: 1/4".3/8',1/2 ... ',3/4',1',11/4',11/2',2',21/2,3',4'2,Certificate: ISO9001 , CE 3 ... mill certificate if required.Production step :1) purchasing the material and forged the semi-products .2) processing the semi-products in workshop ...