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I just got done changing my radiator and there was definitely 2 on the bottom. One is the regular one on the drivers side and the passenger side is a donut that slips over the drain tube and fits in a hole that's in the support.
My DeWitts was a little argumentative, but I think it was a factory second and the tabs are slightly off. I put a touch of red rubber grease on the tabs and cylinder which helped.