Mediates electroneutral potassium-chloride cotransport when activated by cell swelling. May contribute to cell volume homeostasis in single cells. May be involved in the regulation of basolateral Cl(-) exit in NaCl absorbing epithelia. Inhibited by WNK3. Homomultimer and heteromultimer with other K-Cl cotransporters. N-glycosylated. Activated by N-ethylmaleimide (NEM). Inhibited by furosemide and bumetanide. Belongs to the SLC12A transporter family.