OBDII reading OBD

Hello

I was in AutoZone a few days ago and saw a plug that allows an OBDII code reader to read OBD codes. (I don't remember the brand) Is this adaptor just just for a certain reader or will it work on all OBDII readers? Is it just a pin rearanger or is there an interface built in?

I have this reader: Link --> http://obddiagnostics.com/

I was thinking about going out to the bone yard and pulling an OBDII plug off of any vehical and buying a plug to fit an OBD and making an adaptor.

Anyone out there with any info on this?

Thanks

Dan