There is a special socket for these. You need the particular socket for
it, it's not a standard 6, 8 or 12 point. If you can get to it with an open
end wrench (that's never happened to me with the engine in the vehicle) one
of the larger wrenches will work, can't recall the size off hand.
i think i will just take the egr valve off and slip an adjustable loop
wrench around it, if i can't find a socket to fit. if a 26mm deep fits
i will buy it, because i will need a 26mm some day. i never thought i
would need a 22mm or 21mm and i ended up buying them.
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