I purchased the Provent and GU 3.0 kit from Western Filters. All arrived as advertised BUT when I tried to fit the return hose it turns out it is 16 mm, not the 12 mm of the input hose. Nothing in the kit says anything about size differences.
So if you plan on fitting a Provent to a 2006 GU 3.0 Di, plan on getting some 16 mm hose and a 12mm to 16 mm coupling if you go that route. I just fitted the 25 mm hose about 50mm long to each Provent connection, then fitted a copper sleeve in both hoses (to prevent crushing) and clamped them to the 25 mm hose past the end of the Provent . Both hoses are pushed into the Provent connections.
Works great and is tidy.
See attached:P9160133.JPG
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I did replace the bolts with correct length once I had it all sorted.
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