Fits F800GS/GSA
Also fits F700,800-F/R/GS/GS-A

The special fuel neck prefilter is designed to be mounted inside the original fuel cap. To install you’ll remove the screws holding the flip-cap in place, fit the filter and retainer, and refit the flip-cap.  Installation PDF: F800GS Installation

But an easier way to understand the installation process is to watch this video.

The HDM3D media filters down to 10 Microns, which will allow a very good protection of the fuel pump and main filter. WATER,  and other contaminants (liquid and solid) will be separated during refueling.

The original BMW fuel filter system has a strainer working between 40 and 60 microns, made from nylon mesh, which is totally inadequate to protect the fuel pump.

This filtration level will both preserve the fuel pump and prolong fuel original filter life, thereby avoiding nasty surprises and high repair costs.

When ordering please list your bike’s make, model, and year in the order notes.