It is pretty big (the old style one). I got a set of crows feet that went up to 22, I believe, and couldnt get a fit.

Ended up buying a stubby adjustable wrench that had a very wide opening, and that worked like a charm.

I believe the new updated one went on with a crowsfoot wrench.

JMH

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)