Fuel tank filter just for ACERBIS tanks with BIG CAP or BIG LOOKING CAP
 
Designed to trap dirt and debris that may come from dirty fuel cans during re-fueling
It help avoids dirt to enter and compromise the fuel system (especially injectors and fuel pumps) and ruin your race or day out.
The filter can catch particles from a minimum size of 40 micron.
It is vital to remove the filter and regularly clean it.