The listing, Cooper Wiring Hart-Lock Locking Connector CWL1420C has ended.
Plug, 3P-4W, 20A 125/250V, L14-20, Black Body, White Face
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Arrow Hart - Cooper Wiring Devices
Twist Lock Plugs, LOCKING TYPE Series
Item# CWL1420P - Plug, 3P-4W, 20A 125/250V, L14-20, Black Body, White Face
LOCKING TYPE Series Information
15, 20, and 30 Amp Models
125~480 VAC
3 and 4 Wire Configuration
Single and Three Phase