Enables GDP phosphatase activity; IDP phosphatase activity; and UDP phosphatase activity. Located in cytoplasm. Is expressed in several structures, including adult head; adult heart; gland; and salivary gland body primordium. Orthologous to human ENTPD5 (ectonucleoside triphosphate diphosphohydrolase 5 (inactive)) and ENTPD6 (ectonucleoside triphosphate diphosphohydrolase 6).