Hart-Lock(Cooper) Industrial Grade 50A Locking Devices- Plug/Connector & Receptacle, 50A, 125/250V/AC 3-Pole/4-Wire.
Catalog Number: Plug CS6365EX (Nylon, Black & Red) Connector CS6364EX (Nylon, Black & Red)
Receptacle CS6369 (Black)
New/Never used
Asking $75 Shipped
http://www.electriciansupplies.com/product.cfm/p/96707/Bryant-CS6369.htm
Catalog Number: Plug CS6365EX (Nylon, Black & Red) Connector CS6364EX (Nylon, Black & Red)
Receptacle CS6369 (Black)
New/Never used
Asking $75 Shipped
http://www.electriciansupplies.com/product.cfm/p/96707/Bryant-CS6369.htm