Oil breather valve racing, without reed valve assy, machined from light alloy billet and then given an anodized surface finish. Compatible with Ducati Diavel 1200 2011-2019, Monster 1200 s 2014- 2019, Monster 1200 2014-2019, Monster 821 2015-2019, Supersport 937 s 2017-2019, Supersport 937 2017-2019.