Machined aluminium cord connector in NPT hub sizes 1/4 inch through 1 inch and cast aluminium 1 to 3 inch. They provide durable performance and a clean attractive look without adding unwanted weight. Made of aluminium. Straight male cord connector body style. 2-1/2 inch NPT hub. -34 to 115°C operating temperature. 2.95 to 3 inch recommended knockout hole size. Suitable for use in hazardous locations per class I division 2, class II division 1 and 2, class III division 1 and 2 NEC reference 501-4 (b), 502-4 (a), 502-4 (b), 503-3 (a) and 503-3 (b).