Abstract: Provided is an actuator for use with an aerosol can drain clearing device that removes a drain blockage with pressurized gas contained in the aerosol can. The actuator includes an actuator piece with an actuator dome having a dome aperture therethrough and at least one sidewall that circumscribes the dome aperture. One end of the sidewall is slanted and forms a gas-tight seal with a sink drain flange circumscribing a sink drain. In one embodiment, the actuator includes a coupling piece configured to slidably coupled to the actuator piece at one portion of the coupling piece. In use with a pressurized gas aerosol can, the aerosol can is coupled to another portion of the coupling piece.