Yeah for the fill, but the real deal is the drain..
I have a secret for you, and you only. google this: F124N and look at the images. Perfect for your bike
when I write my bike building manifesto for my future low-impact lifestyle job, my builds will have key upgrades like this and others that just make practical sense and look classic. Hope I didn't oversell this, but oil changes are freakin messy as hell.