Locking Power Supply Cord, NEMA Locking. All these have high quality and reasonable price.

Specifications: L14-20P, 20A 125V/250V,

12/4--10/4

SJT/ SJTO/SJTOO, SJTW/SJTOW/SJTOOW,
SJ/SJO/SJOO/SJW/SJOW/SJOOW
ST/STO/STOO/STW /STOW/STOOW,
S/SO/SOO/SOW/SOOW
SJE/SJEO/SJEOO/SJEW/SJEOW/SJEOOW,
SE/SEO/SEOO/SEOW/SEOOW