Apart from the clip, which keeps the two halves of the filter housing together, there's a thin rubber o-ring between them. This may have hardened over the years and won't reseal even with the clip in place. My seal leaked after fitting the FOC and I had to do the whole job again with a new o-ring. You'll find discussions on this subject by searching for 'FOC' - (the Fabled Orange Clip)..
TC.
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