Jeff's 2009 rack, with Furman PL-Plus Series II power conditioner (very top)
Power conditioner, providing a steady 120V, 15A of power from a possibly unstable mains line, to avoid frying a lot of expensive gear. Has 1 front outlet and 8 rear outlets. Seen in Jeff's 2009 rack gear, used to power everything else in it.
[product page (pdf) | PL-Plus C page]