I’ve had a leaky oil pan for a little while now and finally decided to take it off and seal it properly. After removal I was suprised to see the rubbery plug on the transmission behind the oil pan was chewed up and barley hanging on. Not sure what could have happened to it, but I’m sure it was installed like that by the previous owner. Not sure what the plug is for either... Maybe to view the transmission? Nonetheless I need to find a new one. Does anybody know what this is called or where I could get a replacement?

‘86 4wd 22RE auto pickup.