Good point Beller, I remember suspecting the Bristol filter works inside out, in that any crud stays within the filter rather than settle at the bottom of the bowl. Now I'm home I've taken a better look at the item, and it's not so much an adaptor as a replacement for the filter housing, which will have the filter will screw on horizontally. Only snag here is not being able to completely fill a replacement filter with oil before fitting, not really a problem, although I'd best ensure filters have a non drainback valve.
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