Not a personal use recommendation, but have you looked at mAbs 14E10 or 16E4, available from LSBio ( https://www.lsbio.com/antibodies/scnn1a-antibody-enac-alpha-antibody-clone-16e4-wb-western-ls-c759870/785721?trid=0 )and a few others? We also list other sources for anti-ENaC alpha which you may want to explore: https://www.linscottsdirectory.com/antibodies?q=ENaC%20alpha