Throttle pressure kick down seal

No, it seals anyway when the lip is facing down and the washer just holds it in place.
Think of it this way, the seal lip sits against the inner bore of the selector shaft and the inner circumference of the seal seals around the TP shaft
The fluid you're keeping in wants to come up from underneath it so the sharper edge of the seal goes toward where fluid comes from. (so sharp outer edge facing down)