Aprilia O-Ring oil filter housing AP0650500
Fitment - RSV 98-10, Tuono 02-10, Caponord 01-07, Falco 00-03, Futura 01-04
Genuine Aprilia oil filter cap O-Ring, part number AP0650500, item 3 in the diagram.
The oil filter cap has an o-ring behind it on the Gen 1 and 2 V990 motorcycle engines. Here at AP Workshops we recommend you replace this o-ring on a regular basis when changing the filter, in order to maintain the integrity of the sealing properties it was designed to provide.
As it's a direct replacement with the one fitted in the factory, it's a very straightforward process to swap it.