AC WORKS 1.5ft NEMA 10-30P to NEMA 14-30R 30-Amp 3-wire To 4-wire Grounding Single To Single Black Basic Flexible Adapter in the Adapters & Splitters department at Lowes.com
Parkworld 62954 NEMA L14-30P to 10-50R Adapter 4-Prong Generator 30A Locking Plug to Electrical Oven or Stove 3-Prong 50A Outlet (Yellow) - Walmart.com
AC WORKS 1.5 ft. L14-30P 4-Prong 30 Amp Generator Plug to 6-30R 3-Prong 30 Amp 250-Volt HVAC Female Adapter L1430630-018 - The Home Depot
RV 30 Amp Generator Plug Adapter 4 Prong - RecPro
Amazon.com: Fullsky FC-TTL431 NEMA TT-30P to L14-30R 3 Prong to 4 Prong generator adapter cord Male TT-30P to Female L14-30 Receptacle 30A 125V Output 125V : Patio, Lawn & Garden