I used to run a shop, so I got used to always following ABYC. We did mainly electronics/electrical, but every now and then we did engine stuff.
Sometimes I think the standards are counter-productive. I really can't stand the "no valves for draining water from the filter" rule. Trying to get a plug unscrewed and not get gas everywhere has to be more dangerous than a valve
I heard a rumor a valve with a cap screwed on would be pretty safe unless you forget to put the cap back AND the valve leaks
I might try that.