Hubbell Wiring Device-Kellems HBL420C12W Pin & Sleeve Plugs & Connectors; Pin Configuration: 4 ; Number Of Poles: 3 ; Amperage: 20A ; Maximum Cord Grip Diameter: 0.8300in; 21.10mm ; Connector Diameter: 3.66in; 93mm ; Overall Length: 7.9000in; 200.60m