Ever wonder what that small tube on your Volvo D13 or Mack MP8 is actually doing? That’s the Venturi Tube — the part responsible for measuring EGR flow using a pressure drop so the ECM knows exactly how much exhaust gas is being recirculated. When it clogs or leaks, you get bad readings, poor performance, and derates.Raw clip explains it all.TAT Express4140 Langdon Rd, Dallas TX 75241972-225-3017Google link: https://maps.app.goo.gl/KzW9PgYB8Vr7Vw8x7?g_st=ipcFull video: https://youtu.be/roRAA_ZTa