They aren't from the DNX408, they are prototype Big Bores for the DEX410..
As for leaking... They don't, it might help next time if Mr Crabb asks before photoing.... We'd been messing about changing oil, so I'm not sure when he took the photos, but rest assured they don't leak.
When - When we've tested them and found them to be a worthwhile addition to the Durango range.
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