16 SJTW AWG Heavy Duty Power Cord 3 Prong Extension Cord, NEMA 5-15P to NEMA 5-15R, Power Cable for Indoor and Outdoor Use, Black Color, ETL Listed (2 Packs 8FT Black): Amazon.co.uk:
How to Wire a 3 Prong Extension Cord Plug - This Old House
Online Waterproof Short 3 Prong Extension Cord Inline | eBay
Otimo 25 Ft 12/3 SJTW, 2 Pack Outdoor Heavy Duty Extension Cord - Professional Series - 3 Prong Extension Cord, Red: Amazon.co.uk: Electronics & Photo
ORBHES Extension Cord USA 3 Prong Male Plug to Female Socket Extension Cable American NEMA 5-15P To 5-15R Power Cord 0.3m/0.5m/1m/2m Long Extension Cord (Size : 2m) : Amazon.co.uk: Electronics & Photo