MIT - Z-Duplex Super - In-wall AC Power Conditioner The MIT Z Duplex 20A Super in-wall power conditioner and surge protector replaces your standard electrical receptacle, installing in minutes with no special tools needed. Our Price: $199.00 Related Searches: Receptacle | Power Conditioner MIT - Z-Duplex - In-wall AC Power Conditioner The MIT Z Duplex in-wall power conditioner replaces your standard electrical receptacle, installing in minutes with no special tools or adaptors needed. Our Price: $99.00 Related Searches: Power | Power Conditioner | Receptacle