The EPEXC-100-12.4-20A is a 100-foot explosion proof 12/4 SOOW extension cord. This 20-amp rated, chemical and abrasion resistant cord comes with an explosion proof 20-amp receptacle on one end ...

You can tell a 250-volt 20-amp plug from a 125-volt plug by the right prong, which is sideways. That means you can’t plug smaller things into this receptacle because of the higher voltage.