This is a  Pass and Seymour L14-30R locking receptacle.  It is brand new and in original factory box. MADE IN USA.  Pass & Seymour is among the most respected electrical device manufacturers. This receptacle will accept L14-30P male locking plugs.  It is 4 wire and 30 amp rated for 125 or 250 volts. Leviton equivalent part number is 2710 Bryant part number is 71430FR and Hubbell part is HBL2710.   Shipping is 2.99 for the first receptacle and $1.50 for each additional to all U.S. locations via Mail.  I use 1st class or Priority Mail for shipping.  (3 or less will go 1st class and 4 or more will go Priority).