NEMA 5-20P Straight Blade Replacement Plug Connector, Male Extension Cord Ends, 20 Amp, 125 Volt, 2 Pole, 3 Wire Grounding - AliExpress
Amazon.com: IronBox Electric - Heavy-Duty C20 to C19 Power Cord - 20A/250V Rated, 12/3 SJT IEC 60320 Equipment to PDU Cable - Male End C20 Plug/Female End C19 Connector - UL Listed
Monoprice Heavy Duty Extension Cord - Locking NEMA L5-20P to NEMA L5-20R, 12AWG, 20A/2500W, SJT, 125V, Black, 10ft - Monoprice.com