This is not a OEM Honda drain plug washer but it works fine! It is the same size and thickness as OEM. I have done 3 transmission flushes with a new washer at each fluid change and have had NO leaks from the transmission drain plug. There are a lot of washers in the package that should last a long time. Remember to tighten the drain plugs to spec and you shouldn't have any problems. I'm happy with that.