https://www.acehardware.com/departments/lighting-and-electrical/boxes-fittings-and-conduit/conduit-connectors/3007725
Halex 3/4 in. D Steel Reducing Washer For Rigid 2 pk Mfr# 96832 - Ace Hardware
1 in. x 3/4 in. Rigid or IMC Conduit Reducing Washers (2-Pack) effectively reduce the size of the knockout in a steel outlet box or other metal enclosure. Each...