This item is a Explosion-Proof Connector Plug, 20A, NEMA 5-20P - Aluminum (125V) manufactured by Appleton.
Features:- Unique blade-type, brass contacts exert constant pressure along entire contact surface and provide superior electrical contact
- Insulators provide superior dielectric and mechanical strength and lowest arc tracking
- Longer plug housing for better gripping and easier plug insertion and withdrawal
- Plugs fits any standard non-explosionproof receptacle (NEMA 5-15R, 5-20R, or 6-20R) as well as U-Line explosionproof receptacles
- ECP plug: a twist of the plug produces audible #8221;click#8221; to indicate fast make and break of built-in switch contacts
- Twisting plug locks it in place and cannot be accidentally pulled out
- NCP plug: special neoprene watertight plug bushing accommodates flexible cord ranging from .538#8221; to .639#8221; diameter
- ECP plugs are UL Classified for use with Crouse-Hinds PowerGard#8482 and ArkGard#8482 receptacles