If you have had the transmission (2nd gear) recall done on your Odyssey, the transmission filler plug IS GONE! To refill after draining, remove the 12mm bolt holding the "banjo" fixture that now lives where the filler plug was. The new fixture (a fluid jet) will lift STRAIGHT OUT (about 3" long). Add your fluid, then replace the new jet (make sure it's seated squarely & fully), replace the 12mm bolt and you're DONE!