LDR Industries 530 2165TL Led Faucet Aerator Red To Blue Temperature Indicator Light for Hot or Cold, 55/64"-15/16" x 27, Chrome Includes adapter to fit most kitchen and bath faucets - female 55/64-Inch threaded nut - black plastic adapter: 55/64-Inch to 15/16-inch 27 threads LED Aerator indicates water temperature; lights red color if above 35C/95F, lights blue color if below 35C/95F Runs entirely on the water stream pressure from your faucet - no batteries required This meets AB1953 code as a lead-free aerator - safe for drinking water Solid brass swivel ball and arm