I <cough> need a new gas cap but found conflicting comments on vented vs. unvented.

Found the Toyota OEM part - seems common to pretty much every Toyota 82-88.. but no mention if vented or not:.

https://parts.toyota.com/p/Toyota_19...731012140.html

My previous cap was unvented (pssshtt sounds when opening) but was a replacement and not sure is was right. '87 Cargo 2wd MT.