... valve: 1,Size: 1/4".3/8',1/2',3/4',1',11/4',11/2',2',21/2,3',4'2,Certificate: ... 1205)threaded: BSP,NPT6)opening /closing tests:20000times Anti-Oxygen glue applied to join body &bonnetSuitable medium ... line from production in each workshop, one special inspector inspect the goods in random ... able to provide you test certificate and mill certificate if required.Production step :1) purchasing the material ...