30A L14-30 4-prong Locking Plug Generator Extension Power Cord | 10 AW – Ceptics
GearIT 30-Amp 4-Prong Portable NEMA L14-30 Generator Cord for Emergency Power Outage, 10-ft - Walmart.com
generator cable
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
VEVOR 30 Amp Generator Cord 4 Wire 10-Gauge 40-ft / 4 3-Prong Outdoor Sjtw Heavy Duty General Extension Cord in the Generator Accessories department at Lowes.com