ok it was bit of a dumb question,but just got a new one and there are **** loads of rubber O rings,various sizes,wot the **** for.
 
I guess its the version that the can is locked together by the filter head and bowl.

Well the big seals do the filter head and bowl, the small one does the inner part of the head, the other one which may be the smallest, is for the leak off tap.
 

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