Tapered hole major diameter is 3.500 inches , flow direction is from the outside in; cylindrical shape
NSN 6135-01-604-8739
NSN 5915-01-234-4604
NSN 6135-01-419-5574
NSN 5895-01-474-5209
NSN 5905-01-222-0927
NSN 2925-01-041-2360
NSN 5895-00-907-8710
NSN 5960-01-127-0246
NSN 5998-00-382-9284
NSN 5998-01-233-1668
NSN 6240-00-244-0483
NSN 6110-01-191-4725