Grounding Hub, 3/4″ Brass Alloy with Buna-N O-Ring
https://dev.nsiindustries.com/product/grounding-hub-3-4-brass-alloy-with-buna-n-o-ring/
The Bridgeport Mighty-Bond 3/4″ Raintight Grounding Hub Brass Alloy with Buna-N O-ring, steel locknut and stainless steel set screws used in wet and dry locations and with rigid and EMT conduit functions as a raceway bonding hub, yoke or choke.