WEN Twistlock Adapter in the Generator Accessories department at Lowes.com
Generator Power Extension Cord - 10/4 - L1430E-010B-050-BLK Generator Power Extension Cord - 10/4 - L1430E-010B-050-BLK - Duraline
Top Deals Heavy Duty Industrial Grade UL Listed Generator Hot Power Locking NEMA L14-30P Twist-Lock Plug 30A 125-250V 3P 4W US Outdoor Black - Walmart.com
Amazon.com: L6-30 Generator Plug and Connector Set - 10 Pack, L6-30P + L6-30R, 30A, 250V, 3-Prong for 7500W Generators - Iron Box # IBX-L630PR (10) : Patio, Lawn & Garden