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 embryonic and larval tracheal systems in the dorsal trunk and transverse connective (TC), but not in the junction between the dorsal trunk and TC, and in several tracheal branches and terminal cells. In larvae, also expressed in ventral pits. Expressed in the taste-sensing terminal organ of the larval head. In adult, expressed in hairs on the tibia, femur, tarsi of the leg and wing margin. Expression is first detected during late embryogenesis, at stage 15 in the dorsal trunk. At stage 16, expression is observed in the TC and extends into the primary branches. By stage 17, expression is more extensive in the primary branches and in some secondary branches. Belongs to the amiloride-sensitive sodium channel (TC 1.A.6) family.