These connections are used in the transfer of water, brine, water-based chemicals/acids & gelatinous proppant (sand) slurry used at hydraulic fracturing sites. Their one-piece design provides no welds or pipe threads to deteriorate and cause premature leakage. They meet ASTM/AISI standards and are interchangeable with other reliable brands. The female halves are supplied standard with two-piece hammer union nut (Part # NHU-NUT-206-400).