Part of a complex that plays a role in tracheal liquid clearance. In both larvae and adults, contributes to the behavioral response to salt. Probable role in sodium transport. Expressed in the tracheal system. Expressed in the taste-sensing terminal organ of the larval head. In adults, expressed in hairs on the tibia, femur and wing margin, but not in hairs on the tarsi of the leg. Belongs to the amiloride-sensitive sodium channel (TC 1.A.6) family.