Size or part # for fuel-filter housing plug?

[GreyEnvy]

Anyone know the size/thread or part number for the missing plug on this fuel-filter housing for a 2001 A1? I dropped it and it's gone forever. I spent an hour searching my TMs, the parts number spreadsheet, and the forum.

 

[Guyfang]

What parts TM are you using?

 

[Ronmar]

It is probably a SAE-4 or -6…

you have a bunch of -4 adapters all over the truck on the hydraulic system(Jic-4 to sae-4). Probably the easiest one to reach is on the spare tire crane Or the hand pump Unscrew the hose end fitting then remove the adapter from the cylinder or pump port(-4) and see how that compares to size in the filter port…