TRANSMISSION SERVICE F150

2001 F150, 4.6 V-8, 95K MILES, I AM CHANGING THE FILTER IN THE TRANSMISSION AND WHEN I DROPPED THE PAN AND FILTER THERE WAS A SMALL PLASTIC PART IN THE PAN . IT KIND OF LOOKS LIKE A GOLF TEE OR MUSHROOM, IT HAS A STEM ABOOUT 1" LONG AND ABOUT 1/8 INCH DIAMATER, THE HEAD IS ABOUT 1/2" DIAMTER WITH AN ORING ON IT. THE HEAD IS KIND OF LIKE A MUSHROOM. WHERE DOES THIS GO, I CAN'T SEEM TO SEE ANYTHING THAT LOOKS LIKE A PLACE FOR IT

THANKS, I MADE A DONATION BUT I AM NOT SURE HOW TO SHOW YOU THAT HERE