Conntek 29139-180 15-Feet Locking Power Cord for Model L6-30P to Model SJTW 10/3, 30-Amp, 250-volt (Pack of 4)
Conntek 29139-180 15-Feet Locking Power Cord for Model L6-30P to Model SJTW 10/3, 30-Amp, 250-volt (Pack of 4)
$263.27
Check on amazon

NEMA L6-30P 30A Locking Plug Bare wire/Hard wire Locking Power Cords No assembly required

NEMA L6-30P 30A 250V Locking Plug to ROJ Power Cord, 30A 250V Approval: Plug, 15FT SJTW 10/3: UL, C-UL.