Legrand-Pass & Seymour L520-P Locking Plug. Pass & Seymour® Turnlok® Locking Plug 125 VAC 20 A 2 Pole 3 Wires NEMA L5-20P Industrial Grade 0.385 to 1.15 in Cord Dia -40 to 75 deg C Nylon Black/White 2.2 in Dia x 3.8 in L. Additional Description: PS -L520P TURNLOK PLUG 3W 20A 125V B&W. Catalog Description: Turnlok Plug 3wire 20amp 125volt.