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)
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)