5 Toilet Fill Valves, Nuflush Fast and Quiet Toilet Fill Valves. Fix Five Toilets. NuFlush, under water mini pilot fill valves are very quiet because there under water. NuFlush, We make toilets flush better. Fits all American type toilets, very easy install in minutes. Turns off and on by water preasure The more water you can put into your toilet the beter it will flush.