This might be of interest:
http://www.audioexcellenceaz.com/worldpower.htm
As John suggested, a comparison of this to the Wattgate would be interesting. I have not used the PS Audio, but it is a Hubbell 8300 (which I have used) with extra nickel plating and the World Power units, as I said above, are superior in a very major way to the stock 8300, so I'm making an educated guess that these are quite superior to the Power Port.
http://www.audioexcellenceaz.com/worldpower.htm
As John suggested, a comparison of this to the Wattgate would be interesting. I have not used the PS Audio, but it is a Hubbell 8300 (which I have used) with extra nickel plating and the World Power units, as I said above, are superior in a very major way to the stock 8300, so I'm making an educated guess that these are quite superior to the Power Port.