Cannock

I have recently purchased a 86 911 Targa but did not get an owners manual. I have been trying to figure out what the plastic filler cap is that is beside the gas cap. I though it was for windshield washer fluid, but I see that you can fill that under the hood. Can someone enlighten me as to its purpose? Also, any other recommended sources for an owner’s manual besides Pelican Parts (back ordered for 3 weeks now).

Thanks

Millzeee

its for your washer fluid