Sodium permeable non-voltage-sensitive ion channel inhibited by the diuretic amiloride. Mediates the electrodiffusion of the luminal sodium (and water, which follows osmotically) through the apical membrane of epithelial cells. Controls the reabsorption of sodium in kidney, colon, lung and sweat glands. Also plays a role in taste perception. Heterotrimer containing a delta/SCNN1D, a beta/SCNN1B and a gamma/SCNN1G subunit. The additional delta/SCNN1D subunit exists only in some organisms and can replace the alpha/SCNN1A subunit to form an alternative channel with specific properties. Channels including isoform 2 exhibit greater conductance than those containing isoform 1. Belongs to the amiloride-sensitive sodium channel (TC 1.A.6) family. SCNN1D subfamily.