Sand Casting Valve Stem Cap 1)Grey Iron, Ductile Iron 2)Sand Casting Process ... NC Machine and CNC 4)ISO9001:2008 Sand Casting Valve Stem Cap1)Grey Iron, Ductile Iron2)Sand Casting Process3)Machined by ... , BF,BS, JIS, UNI, ANSI, ISO etc. Sand Casting Valve Stem Cap