Digging around in my photo-stash, I found a operational Sunpak TR-PAK II battery pack with a 3 pin connector at the end of the cord. This battery pack would have been sold with a 3-2pin plug but it seems mine is missing. The plug itself has been discontinued for quite sometime now. The following is a link that shows a picture of what I am looking for: http://www.bhphotovideo.com/c/product/171193-REG/Sunpak_ZZZ001S_Conversion_Plug_Adapter_for.html Does anyone have one in their closet they are willing to sell? I intend on using this unit with a Sunpak 422. I would also be interested in any Sunpak TR-PAK II battery packs that are in working state. I have two Sunpak 422D in my "strobist" kits I would like to power.