Enables sodium:proton antiporter activity. Predicted to be involved in potassium ion transmembrane transport; regulation of intracellular pH; and sodium ion import across plasma membrane. Predicted to act upstream of or within protein localization; regulation of pH; and sodium ion transport. Predicted to be located in apical plasma membrane. Predicted to be active in plasma membrane. Orthologous to human SLC9A2 (solute carrier family 9 member A2). [provided by Alliance of Genome Resources, Apr 2022]