Amazon.com: Houseables 30 Amp Generator Cord 4 Prong, Extension Generator Cable, 10 FT, 125-250v, 7500 Watt Max Rating, UL CUL, NEMA L-14-30P, Rubber, 10 Gauge, Heavy Duty, L14-30, Transfer, Twist Lock Power
30 Amp 3-Prong NEMA L5-30P/L5-30R RV Generator Extension Power Cord – Tooliom
Houseables Generator Extension Cord, Electric Wire, 3 Prong, 30 Amp, 250 Volt, Single, Black, 25 Ft, All Rubber, 10 Gauge, Heavy Duty, L6-30, Commercial, Electrical Power Cable, with Locking Switch - Amazon.com
Conntek NEMA L5-30 30A 125V Generator Extension Cord
Reliance PC3040 40-Foot 30-Amp 120/240-Volt Power Cord – PC3040 – DuroMax Power Equipment