The CW threaded, splash proof IP67 sealed bushing for actuators other than T and T1 has an internal O-ring and a standard external bushing seal washer. The external bushing seal is placed on the switch. The switch is inserted into the panel and then the mounting nut is applied. Once installed, the switch is IP67 sealed above the panel. The CW threaded, splash proof IP67 sealed bushing for T and T1 actuators has an internal O-ring standard. An external bushing seal washer is available separately from APM Hexseal. The part number is MFS-60064. The external bushing seal is placed on the switch. The switch is then inserted into the panel and the mounting nut is applied. Once installed, the switch is IP67 sealed above the panel.