An Angle ring is a companion flange which is made out of angle iron.

Economy coupler using Ford companion flange and Powerglide flange coupler with double row chain set.

Cold and Warm Forgings: Transmission parts, companion flanges, brake pistons, dampers, differential pinions, maingears and side gears and control arms.

What is going on looking at the High def shots tonite that looks like a companion flange with about 6 bolts why can't they unbolt the top half and install a new sort pipe and valve.