As mentioned the sealing ring is not crucial, as long as the double
o-ring cap is in place and tight.
WARNING: Be careful when removing the 3/4" hose from tube after
filling tranny. You must hold the tube IN while you pull / twist /
wiggle the hose off. My first change resulted in me pulling the tube
part way out while trying to get the hose off. Fortunately I had
cleaned the area well, but... I am now more cautious when removing the
fill hose. It would ruin your day to pull the tube out and have crud
fall into your fresh fluid.
