3 ft. 30A 125/250V Generator Y-Adapter Cord - Champion Power Equipment
Locking Power Cord Adapter 50A Male To 30Amp Female Twist Power Cord Male to Female Camper Generator Cable Adapter Electrical Converter Plug - Leisure RV Parts
Generator Adapter Cord NEMA 5-15P For Transfer Switch, Extension Cord Adapter (3 Prong Plug 12AWG 125V) - AliExpress
Clear Power 12/3 STOW 2 ft 3-Outlet Generator Jobsite Extension Cord Adapter with “W” Splitter, CP10136 - Walmart.com