What is this oil tank connection part number/name?

[plymouthcolt]

I got in my car and started driving yesterday and noticed the power was down and acceleration was lumpy. It felt like I was running on less than six cylinders, and I figured a spark plug connector was loose.

While checking I noticed this split short piece of hose. I guess it's part of the oil tank breather/vacuum/pressure system?

I can't locate the name or number in the parts diagram so hopefully someone can provide this information . Thank you.