The Screw is the cheapest item from this partsfiche.
Parts such as the 036 Canister Filter [mod:ms1200s;xst:aus,eur,fra,jap]: Screw Tef M5x12, Hose, Drain, Clamp, Nipple, Hose are included in the Mts1200s 2015 My15 (multistrada 1200s Abs) D210-00015 036 Canister Filter [mod:ms1200s;xst:aus,eur,fra,jap] parts fiche.
On this parts fiche the Clamp is the most specified component.