When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
As I recall, a few threads are exposed. There should be room for the Caution - POSI red plastic tag to hang on there also.
I usually put a dab of pipe dope / thread sealant on there too.
I do not apply any thread sealant on it ...and so far...in 30+ years...I do not have any oil wicking out from the threads of the fill plug.....but do as you wish