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With a range of sizes, materials, and abilities, the GXSW fittings were produced by Dk-Lok with advanced ASME B31.3 designs. Developed for tight connections of four systems and configuration, each fitting provides standard hex wrench assembly and process control. View the complete list of products below to find the one for you, and if you have any questions concerning any of our items, please contact us at or chat with us live.