2.0 & 2.3 LITER. 2.3 LITER. Tube. A component which is used to attach the vehicle wiring harness to the EGR valve. Exhaust Gas Recirculation (EGR) Tube Adapter. Exhaust Gas Recirculation (EGR) Tube. (EGR) Adapter. Connecting. EGR valve. Included with: EGR valve.