... .Sand Casting Supplier of AVK & USPipe 2.Certificate: SGS ISO9001:2000 3.Material:Ductile iron Casting,Grey Iron Casting, Ductile Iron Casting & ... Gray Iron Casting, such as, Grooved Pipe & Fittings, Valve Body & ... all over the world such , WATTAS, MUELLER,US PIPE,Kurdizel, etc. and we were awarded as the best ...