Material = CNC Machined 6061 T6 Flange OD = 2.975" ID = 1.500" Tapped holes = x5  10-32 .430 Deep on a 2.120" BCL Male thread = 1.50" NPT  This Adapter allows you to adapt certain 5 bolt sending units to a 1.50" NPT fitting. This is Especially useful when it is not possible to add another port to your existing tank or if you want to add a fuel sensor to a Drum.   CRITICAL NOTE!!!  The ID of this adapter is 1.50". This hole size WILL NOT work for EVERY sensor float on the market, you need to measure your float size and verify that it will pass thru this adapter first.    We have found that it DOES work with Rochester 9800, Wema SSL, Moeller swing arm mechanical BUT you should expect some accuracy issues at full because of the increased height.