All I can confirm is that it is indeed bigger than the one used to change the oil.diesel - this is an excellent contribution to the diesel oeuvre.
A quick question: did you get a measurement on the filter housing nut? I'm curious to know the size of socket we'll need. I have a 32 mm one from Snap-On that's intended for oil filter housings. Maybe it'll work.
It's also possible that the O-ring will swell in the presence of diesel fuel.
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