The D3919358 Adapter Sleeve reduces the bore size from 9mm to 7mm, thus excepting the 7mm injector. It also acts as a washer, sealing the injector bore joint.
-Order 6 to run 91.5-93 Injectors in a 89-91 Non-intercooled 12 Valve Cylinder head.
-Order 4 to run 7mm injectors in a 9mm 8-Valve 3.9L Cummins 4BT Cylinder head.
