Upgrade your toilet with the Fluidmaster 400A Universal Toilet Fill Valve - the go-to solution for a peaceful bathroom experience. This top-selling fill valve isn't just about quiet refill rates; it's a game-changer for fixing those annoying toilet noises. With an enlarged, easy-to-turn adjustment dial and a pre-installed shank washer, this valve takes the hassle out of toilet maintenance, leaving you to relax and enjoy the tranquility of island living.