P-pump oil inlet fitting with oil restriction.
If you choose to supply oil to your P7100 injection pump from the drivers side, this fitting is a must.
The factory injection pump has a restriction hole cast into the normal feed port. If the other side of the pump is used, the hole is wide open and this fitting is required. Otherwise, oil will flow to the injection pump unrestricted and will flood the gov. housing with oil. This will not allow proper operation of the governor springs/weights.
Fitting is also slightly shorter than a standard fitting to help clear the vacuum pump on 2nd gen Dodge's that have swapped to a ppump setup.