Regulation of fluid secretion. Stimulates Malpighian tubule fluid secretion. Expressed in corpora cardiaca (CC), corpora allata (CA), antennal lobe (AL) and gnathal ganglion (GNG) (at protein level). Expression in CC, CA and AL detected in most animals, expression in GNG in few animals (at protein level). Belongs to the diuretic hormone class 2 family.