My new Superior engine has 4 sump openings with NPT fittings. One is a square head plug safety wired to a boss in the sump casting. The other is where I installed my quick drain and saftied it to another boss in the sump.
There are two other ports with Allen hex NPT plugs with no wire and no boss to drill for safety wire. Why are NPT plugs OK without safety wire ?
There are two other ports with Allen hex NPT plugs with no wire and no boss to drill for safety wire. Why are NPT plugs OK without safety wire ?