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|Thread Diameter:||3/8 in|
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Q:what does this do exactly when screwed into the manifold
A:This BWD Switch - Ported Vacuum - part# EC938 works along with the exhaust gas recirculation (EGR) system. The EGR valve allows some of the emitted fumes from the exhaust manifold to reenter the intake manifold to control fume output. For any further assistance, please visit your nearest Advance Auto store or call us directly at 1-877-ADVANCE (238-2623) and one of our representatives there would be more than happy to assist you.