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Pop-Off Valve double-piston vented outside with PROTOXIDE written on the cover.
Particular sound "Laser effect" issued vent.
Designed to avoid all the problems that other pop-off have on the cars equipped with air flow meter as the Subaru.
Included in the price we spent on the cap.
Very useful to avoid the dreaded hammering, dannosisimi engine and farlalla / and, in fact avoids that issue, the gauge shows no pressure surges, if you see it in your engine this is the valve you are looking for!