Enables P-type sodium:potassium-exchanging transporter activity. Involved in potassium ion transport and sodium ion transport. Located in apical plasma membrane; basolateral plasma membrane; and caveola. Part of sodium:potassium-exchanging ATPase complex. Orthologous to human ATP1B3 (ATPase Na+/K+ transporting subunit beta 3). [provided by Alliance of Genome Resources, Apr 2022]