It's an air pump. In order to meet the sniffer tail pipe emissions test they pumped fresh air into the exhaust manifold to dilute the exhaust gases.
You know I did search google but it didn't come up with much. Thing is I totally overlooked the numbers on black and only searched the numbers on the white side. We don't have emissions tests here where I live. I guess I can do without it. I'll probably just cap off the intake line.