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Get a better grip on that filter. The less expensive wrenches work ok, but if your filter is a bit more stuck than normal, those tools can slip. This one will not. Very nicely machined from 6061-T6 aluminium and than black anodized. Fits all UFI 8 fluted filters for Moto Guzzi machines. 19mm hex fits socket or wrench.
You will need to count the flutes or flat spots on your filter to determine if you need the 8 or 14 flute design.