Vintage Duplex Combo Tandem/Parallel Outlet Receptacle for 4" Electrical Box
In the early 1900s there was a battle being fought over what plug type should
become the standard: Parallel (vertical)or Tandem (horizontal). During that
time frame these "Double T slot" outlets were made to accommodate both plug
types. But, as you know, the Parallel plug type eventually became the US
15A @ 125V
Outlets accept Parallel (Vertical) or Tandem (Horizontal) Plugs
Made in USA
National Tools Mfg. Co.
Condition: New Old Stock
Payment and Shipping
Same or Next Day Shipping
Package Tracking on All Shipments
USPS Shipping Only
Please read the description and review all photos carefully before bidding.