Stuck fuel filters

Bayonet fitting or screw for the cover ?

EDIT Do you mean stuck, as in can't undo the container, or the filters themselves are stuck after you have taken the cover off ?
 
If you are in a hurry, you could put a a large empty pop/water bottle (2L) around it to catch the mess and hammer a screw driver horizontally all the way through it which will give you leverage to unscrew it. Used this many times if no proper wrench available
 
Thanks for the advice guys, panic over, I found a filter strap wrench hidden amongst my spare belts. That with some added grunt got it moving
 
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