Identify This Part Please!

If you have to replace it,I bought a rebuild kit from O'Reillys or Advance not sure wich one but that is a chrysler pump NOT a saginaw.So either way you need a chrysler pump and if you go the rebuild route rent the pully puller that removes and replaces the pully,you will need that one.
BTW the kit was under $20 bucks and it is still leak free.