Mystery connector

Can somebody tell me what is suppose to be at the other end of this connector? It's right under the degass bottle

http://img683.imageshack.us/img683/9697/img0145ak.jpg (http://img683.imageshack.us/i/img0145ak.jpg/)

That would normally plug into your MAF sensor but a small run of 05s came without a MAF.

I know it's gonna sound silly but what is a MAF?

I know it's gonna sound silly but what is a MAF?

Mass Air Flow Sensor