Yellow Jacket 2738 12/3 Heavy-Duty 15-Amp SJTW Contractor Extension Cord, Locking, 100-Feet. SJTW construction with PVC jacket that’s weather and water resistant. Patented locking plugs keeps tools plugged in. Extra heavy duty design works with nearly any tool. Suitable for residential, commercial construction, institutional and entertainment industries. Reinforced blades for added durability, UL Listed. 12 Gauge. The Yellow Jacket (R) brand is a registered trademark of Coleman Cable Inc.