What is this?

[Dukenukemx]

I'm looking at this part behind the engine that's leaking a lot of oil. I'm just not sure what its called. It's right above the crank position sensor, which I happen to also be replacing. I tried looking at all the parts on Rockauto, but nothing matches.

[3X00-Modified]

a little more info will definitely help, such as which engine and year this is in so we can figure out whats there...