... gas,some causticity fluid Detailed Product Description:Connect form: ThreadSize: 1/4"∼4".Suitable medium: water, oil, steam, nitric acid ... .Design and manufacture adoption: ISO, API, GB, BS, we are strict with the security and quality ,it was accepted ... internal, external market.Dimension: 1/4", 3/8", 1/2", 3/4", 1"1 1/2'', 2'', 2 1/2'', 3'', 4''PARAMETERS MATERIAL LIST 1/2"stainless steel ball valve