Eaton Hansen ST-series is a straight through coupling that is designed for use where minimum pressure drop is required and valving is not needed. These couplings are suited for various and versatile fluid transfer type systems. Ball latching mechanism. Smooth bore permits free flow of liquid or gas. Available in NPTF stem end connections. Standard body material: 303 stainless steel. Standard seal material: Buna-N. Applications: fluid transfer; chemical; food and beverage; injection molding; marine; medical; pressure washing and steam cleaning. 1.06-inches hex size. Measures 1-15/64-inches diameter by 2-13/64-inches length.