Genuine OEM Mitsubishi factory replacement Oil Jet Check Valve fits the Evo 7/8/9 and Evo X oil squirters.
Sold individually. Full replacement requires 4.
They are expensive, yes the price is for one valve.
These could be compatible with the 4/5/6 models with modifications.
Please do additional research for your particular set-up first.
Fits these Applications:
2001-2006 Mitsubishi Lancer Evolution VII VIII IX
2008-2015 Mitsubishi Lancer Evolution X