Universal Parts PCV (EGR) Block Off Plate for 50cc QMB139 and 125cc and 150cc GY6 4-Stroke Engines. Sold individually or in packs of 10.

This plate can be used to block off the hole in your cylinder head if your emissions system is leaking or for performance applications. You will need to reroute vacuum lines on your carburetor or switch to a single vacuum port intake and use a non-emissions head cover.