Appleton® and O-Z/Gedney 4QS Series steel liquidtight fittings couplings have male NPT threads. 4QS liquidtight connectors and liquidtight flexible metallic conduit are used in applications where conditions of installation, operation or maintece require flexibility or protection from liquids, vapors or solids such as: machine tool building, motor and transformer terminations, robotics assembly, air conditioning equipment installation and Class I, Division 2 wiring. The compact, slim diameter design results in a connector that offers a small turning radius.