Zhu and Halfon present data in a short technical tip published in FLY that suggests this vector on its own can drive reporter expression in the larval and pupal salivary glands.
http://www.landesbioscience.com/journals/fly/article/3892
Genbank Accession Number AY342348
For sequence: https://www.ncbi.nlm.nih.gov/nuccore/AY342348.1/