This plug screws on to conceal the timing pin on a P7100 injection pump.
This isn't a part you should really ever need to replace... unless you drop it and it ends up in never never land..
Seal/washer not included, please select above if you lost that too.
DO NOT over tighten this cap.. or you WILL have to buy another one.... again.
Second image shown with optional sealing washer.
Bosch: 1423462041 Cap
Bosch: 2916710613 Seal/Washer