Aerator w/Flat, 15/16-27, 1.5 gpm, For Use With Grainger Item Number 21YG72, 21YG73, 21YG74, 21YG75, 21YG76, 21YG77, 21YG78, 21YG79, 21YG80, 21YG81, For Use With Mfr. Model Number SEF-1850, SEF-1850-4WH, SEF-1850-4WH-TW, SEF-1850-8, SEF-1850-8-4WH, SEF-1850-8-4WH-TW, SEF-1850-8-ST, SEF-1850-8-TW, SEF-1850-ST, SEF-1850-TW, Fits Brand Speakman