This is the left side inlet manifold end connector for a Jaguar V12 engine. It's been polished and is ready to be put in your engine!

Others may have identified this as a coolant connector or an inlet manifold end cap. The number on the part itself seems to no longer exist, but look no further!

Part no on the connector: EAC3048PA

Part no (modern): EAC3051 (as seen on https://parts.jaguarlandroverclassic.com/parts/index/part/id/C01.918.91812.91812217.918122173960/brand/jaguar/ number 18)