Durable forged brass construction stands up to harsh operating conditions. Full pattern body permit's quick, easy hand engagement, while double pin lugs allow for correct tool engagement and final tightening. Male NST thread pattern fit's all female NST (National Hose) threads. Flat-faced lead in thread has a broad sealing surface, to accommodate different gasket widths. Fitted brass chain tether can be attached to the valve body to prevent fitting loss or damage. The chains loop ends allow fitting rotation without twisting or binding.