RubberBiker wrote:

I bought two of these:

http://www.screwfix.com/prods/38428/...ches/Wrenches/
Bahco-Ergo-Wide-Jaw-Adjustable-Wrench-8

Having messed about with other tools, these are the biz for firmly
tightening compression fittings (even in awkward locations) without
tearing the corners off the fittings.

Opens to about 42mm IIRC.

They're good, but these:

http://preview.tinyurl.com/coxrcc

Are my favourites from the Bahco range of adjustable spanners. They're
slimmer than most adjustables and the alligator jaw feature is a built
in pipe wrench which comes in handy often.