This is to plug up that gaping hole in your AE111 timing cover when it's sitting in an FR layout (cough...AE86...cough).
4AG 20V Timing Cover Dress-Up Plug
If you're at all concerned about this timing cover plug (or any of the other TPU based products offered here) withstanding the harsh heat environment of the engine compartment and especially within close proximity of the engine, rest assured it's more than up to the task. It's more durable than the timing cover it'll be housed in as well as the oem rubber cover gaskets/seals normally used between each cover piece.
Articles to further acquaint yourself with TPUs (Thermoplastic Polyurethanes) /TPEs (Thermoplastic Elastomers) and their various itirations' properties and the ever growing use in automotive applications.
A simple search.brave.com, seekr.com, google...etc...will net you a trove of even more information.