A dummy head temporality replaces a sprinkler head in a sprinkler system. The dummy head provides for accurate alignment and sizing of a hole in a drywall and in relation to a sprinkler conduit in the sprinkler system. The dummy head is used to prevent breaking an actual sprinkler head while construction workers do an installation of a ceiling to be painted or covered by drywall joint compound of mud, which saves in service fees and redoing the location of the drywall hole for the inner ring to be placed in the drywall hole.