Enables inward rectifier potassium channel activity. Involved in potassium ion transmembrane transport. Located in endosome. Is integral component of plasma membrane. Part of inward rectifier potassium channel complex. Is expressed in several structures, including alimentary system; brain; genitourinary system; respiratory system; and sensory organ. Orthologous to human KCNK1 (potassium two pore domain channel subfamily K member 1). [provided by Alliance of Genome Resources, Apr 2022]