Bridgeport 325-B 1 1/2 IN PLASTIC BUSHING
https://testing.nsiindustries.com/product/plastic-bushing-1-1-2-nylon-plastic-used-with-locknut/
The Bridgeport 1-1/2″ Nylon Plastic Bushing terminates and protects conductors inside threaded rigid and IMC conduits when entering a box using a simple locknut. The bushing is temperature rated to 150u00b0C.