The Edelbrock #91172 Weld-In Oxygen Sensor Bung is for All Edelbrock Pro-Flo EFI Systems, E-Street EFI, QwikData 2, or any application requiring an Oxygen Sensor installed in the Exhaust system. This part is machined from steel stock with an 18 x 1.5mm in Product Features:18 x 1.5 mm Thread PitchSteel MaterialBung O2 Sensor Weld InSold IndividuallyMade In The USA
