Liquidtight 1″ Aluminum Straight Connector, NPT Threads
https://hotfix.nsiindustries.com/product/liquidtight-1-aluminum-straight-connector-npt-threads/
Bridgeport Liquidtight Aluminum Straight Connectors join metallic and nonmetallic “Type B” Liquidtight conduit to a box or enclosure in wet environments. The NPT threads, polyethylene gasket and inner sealing ring provide a liquidtight seal.