Used on turbo air discharge piping on fairbanks morse engine model 12-38td8-1/8 ar4 onboard 378 ft whec coast guard vessels. 10.500" center hole diameter
0.140" hole diameter 4.000" outside diameter 6 bolt hole quantity one 0.120 in. wide by 0.0950in. deep slot centrally located on the id 30 degrees from the bolt hole center