Amazon.com: 25 Feet NEMA L14-30P/L14-30R Generator Extension Cords, 4 Prong Heavy Duty, 30 Amp,125/250V,Up to 7500W 10AWG Cable and The Cable UL Certification,Yellow : Patio, Lawn & Garden
AC WORKS 10ft L14-30P to SS2-50R Cord 10-ft 10 / 4-Prong Indoor/Outdoor Soow Heavy Duty Locking Extension Cord in the Extension Cords department at Lowes.com
Generator Power/Extension Cord with NEMA L14-30P to L14-30R M1169574
Champion 250-Volt Generator Extension Cord | BJ's Wholesale Club
Superior Electric RVA1556 Generator Extension Cord 30 Amp 4 Pole SJTW 10AWG/4, 25ft
4 Prong 30-AMP 10-Feet 250-Volt Generator Extension Cord NEMA L14-30p to L14 -30r Generator Power Cord for Manual Transfer Switch, Portable Generators - China Locking Power Cord L14-30p L14-30r | Made-in-China.com
25' 30 Amp 125/250 Volt 4 Prong L14-30 Extension Cord for Generators - NGP Film