... head cap ISO9001 quality system silicasol shell technology casting stainless steel hexagon head cap1.size range :1/8"- ... QOST, ETC. 7.certificate: ISO9001 Quality System8.products range:stainless steel elbow,tee,crosses,nut,plug,nipple, cap,bushing. Unions ... .ball valve and other stainless steel products according to the customers’drawings; Stainless steel hardware tools, mechanical part, ...