Yellow Jacket 2737 12/3 Heavy-Duty 15-Amp SJTW Contractor Extension Cord, Locking, 50-Feet. SJTW construction with PVC jacket that’s weather and water resistant. Patented locking plugs keeps tools plugged in. Heavy-duty strain relief protects electrical connections resulting in longer cord life. Suitable for residential and commercial construction, institutional and entertainment industries. Meets OSHA specifications, UL Listed. 12 Gauge. The Yellow Jacket (R) brand is a registered trademark of Coleman Cable Inc.