25514 Ardisam 40cc Air Filter Assembly Eskimo Earthquake Viper (replaces the 19511 air filter cover kit).  There is NOT an on/off switch built into the cover on the 25514.

Fits at least one version of these models:

HC40 10" 40CC PROPANE AUGER (HC40Q10)
HC40 8" 40CC PROPANE AUGER (HC40Q8)

SR-4