Applicability:To connect pipelines for well head equipments of oil wells and gas wells, and also to connect pipelines for drilling, flushing, cementing and fracturing equipmentsSpecifications: Size: 1''~4''Working Pressure: 14MPa~105MPaFeatures: Various sealing types meet different requirements with reliable and stable performance. The self-locking ACME thread provides fast and convenient put-on and take down. Parts of the same type are interchangeable. Unions of different rated pressure are easily identified by colors.Reference Standard: All materials are identical to ASTM and GB standard.Hammer unions for sour environment are manufactured in accordance with National Association of Corrosion Engineers (NACE) MRO175 standard and American Petroleum Institute (API) RP-14E standard.End Connections: End connections are either LP female thread or welded type. Customers' specific requirements are also acceptable.