MK Logic Plus K1257WHI 13A Non-Standard Socket Switched in White. Provided with facilities for a clean earth connection, K1257WHI is suitable for non-standard plugs that feature a "T-shaped earth pin. Part of MK's most comprehensive range of switches and plug sockets which exceed British standards, K1257WHI is made from high grade thermoset plastic with antimicrobial properties making it resistant to MRSA, E.Coli, Salmonella and Klebsiella Pneumoniae.