what drill an tap for iat in dog housing?

[2QUICK2B6]

what size drill bit an tap for my dog house to accept a iat ?

 

[Ktbregal]

3/8 npt drill bit 37/64

 

[2QUICK2B6]

thanks I seen another post that said 3/8 npt an tap drill 9/16 ?

 

[etriebe]

9/16 is 36/64, 1/64" difference will be fine to tap

 

[2QUICK2B6]

ty