Nonmetallic Liquid Tight 90-Degree Connector 3/8″, Nylon
https://nsiindustries.com/product/nonmetallic-liquid-tight-90-degree-connector-3-8-nylon/
Use Bridgeport nonmetallic liquid tight 90-degree connectors to join nonmetallic “Type B” liquid tight conduit to a box or enclosure in wet environments. NPT threads, a knockout gasket and inner sealing provide a liquid tight connection.