Receptacle 4-in-1 portable box. NEMA type-5-15R. Terminal wiring screws fit inside a standard single gang wall box. Impact-resistant nylon cover and base for strength and resistance to chemicals and corrosives. Easy-to-read voltage and amperage rating molded onto face. Extra heavy-duty, T-type triple-wipe bronze contacts for maximum performance. Ground holes configured up or down to be outside the device, accommodating up to 4 fed spec size straight or angle plugs. No.8 terminal screws accept up to 12 AWG solid or stranded copper wire. Termination anchor holes for easy conductor wiring. Exclusive shield-wall design protects ground connection from contact with live circuit conductors. A and B molded on face and back for easy identification of receptacle pairs for split-circuit conversion. Convenient built-in strip-gauge.