Sealed ball bearings (no additional oiling is required). Automatic reset thermal overload protection. For use with champion cooler #4001DD, #4001 SD, #5000 DD, #5000 SD, #WC50, #ASA7112 and #RWC50.1/2-HP2-Speed120 volt cooler motor100% copper wound motorsSealed ball bearings (no additional oiling is required)Automatic reset thermal overload protectionFor use with champion cooler #4001DD, #4001 SD, #5000 DD, #5000 SD, #WC50, #ASA7112 and #RWC50UL recognized.