Tapered hole major diameter is 3.500 inches , flow direction is from the outside in; cylindrical shape
NSN 5960-00-098-8847
NSN 6135-01-242-2304
NSN 6130-01-005-8916
NSN 5990-00-359-9839
NSN 5910-01-502-6614
NSN 5905-00-156-2982
NSN 6150-00-647-3285
NSN 6145-01-196-5211
NSN 6135-00-078-9931
NSN 5935-01-125-5522
NSN 5945-01-309-3528
NSN 5925-01-228-3036