Revolution Audio & Power is an Authorized Cardas Audio Dealer in the United States Cardas 4181US Duplex Power Outlet Receptacle 20A 125V Very high quality and a super grip assure all available power is delivered to your equipment. 20 Amp ready. Cool Cardas Blue. The 4181US Duplex Power Outlet features copper contacts, plated with rhodium over silver, for improved electrical contact and current transfer. Amazing grip tension provides solid contact and superb plug retention on the heaviest of cables. The top and bottom outlet can be joined (as with a standard duplex), or completely electrically isolated from each other. Use As A Duplex, Or Isolate Each Outlet Removing the jumpers (a) isolates the positive & neutral. Remove one of the hex-head ground screws to isolate the grounds. High Resolution Instructions: http://www.cardas.com/images/4181US_Instructions.pdf Low Resolution Instructions: http://www.cardas.com/images/4181US_Instructions(LQ).pdf