Thermoplastic connector has built-in hinged, clamp tight strain relief. Polarized, for use with 20 AWG, 18 AWG, and 16 AWG flat SPT cord. May also be used on 2-wire round cord up to 1/4 In. diameter. (No. 18 SV and SVT). 15A/125V. NEMA 1-15R. 2 year limited warranty. UL (Underwriter's Laboratories) listed.