[ramblerdan]

Yes, 14mm. (The MT fill takes a 20mm.)

 

[ramblerdan]

Does that valve lock? I would worry about it opening......if you hit something (roadkill, etc...)

Search term "fumoto" returned this thread, stickeyed in the Accessories, Care and Mods > Under The Hood / Performance section. There are others as well. Safety and reliability of this valve and similar extensively discussed.