Howdy,File under: You pays your money and you takes your chances.
Can't find my post on this topic from many months ago, but I'd bought TWO of these from Green Mountain Generators as spares (the update had already been done on my 802a, including the dremel cutout on the frame, but you never know) and was curious about whether they'd hold up to Diesel (#2, ULSD, stuff from local pump, what I use in the HMMWV and TQGs). Several other people mentioned problems with buying what they thought were diesel-proof wellnuts, soaking one in fuel for results.
So I plunked one of the two I had into a jar of Diesel fuel and let it sit for at least 6-8 months, maybe longer.
Take it for what it's worth, maybe nothing, but the numbers are different on the different wellnuts. I only noticed this today (while I had my reading glasses on).
Now, while swelling may or may not be a sign of breakdown, I SWEAR the fuel I poured into the jar was a LOT closer to clear - or at least a helle Lager Bier) and not imminent signs of kidney failure, or dunkel.
Does ANYONE have a source for honest-to-goodness N-BUNA rubber wellnuts that won't swell, leak, degenerate under exposure to diesel fuel?
I do not know what they sold you. I had, and sold 40+ true military surplus A3816 nitrile rubber well nuts. You can go look at the thread with the pictures.
The infamous Well Nut info