Acts as a receptor for the neuropeptides CAP-1 and CAP-2, but not CAP-3. Probably a component of signal transduction pathway that leads to Malpighian tubule fluid secretion in response to these ligands. In adults, expression in thorax and/or abdomen. Expressed weakly in 16-24 hours embryos and second instar larvae and strongly in first and third instar larvae and adults. Belongs to the G-protein coupled receptor 1 family.