Cord Grip Connector, 1/2″, Zinc for 0.187″ to 0.250″ Cord
https://dev.nsiindustries.com/product/cord-grip-connector-1-2-zinc-for-0-187-to-0-250-cord/
Use the Bridgeport 1/2″ Die Cast Zinc Straight Cord Grip Connector with a 1/2″ KO and NPT tapered threads to provide watertight protection for any flexible 0.187″ to 0.250″ diameter portable cord.