Hubbell-Raco 3512-8 Connector, Liquid Tight, Straight, Flex and Type B Flex, Insulated, 1/2-Inch Fitting is of steel or malleable iron construction that provides raceway integrity Sealing washer included provides a liquidtight seal when terminating the connector in a threadless opening 3/8 in. Trade size UL & CSA Listed For use in Class 1, Div 2; Class 2, Div 1&2; Class 3, Div 1&2 hazardous locations