Please take a very close look at that for me Jack.
Unless they changed we had the anodized alum washer (first orange and then yellow) replaced with a brass one...
Anywho.. to me the OD-9 is the best boat plug I have ever used..
Take care
Grimracer Mike; You are right about the top washer on the OD-9 being brass.The original question was about the difference between the sport blue and the OD-9,as they both use the same seal,my brain fade on the top washer.We have used different colored alum. top washers in both plugs for in house testing.Anyway you are right and i was wrong. J.ODonnell