https://www.fluidmaster.com/toilet/part-type/toilet-fill-valves/ Toilet fill valves refill the toilet tank and bowl to the correct water levels after flushing. Fluidmaster invented the fill valve technology in 1957 and is the largest-selling brand of fill valves. The 400H PerforMAX Toilet Fill Valve has been specifically designed to boost your toilet’s performance, providing a consistent and reliable flush. Say goodbye to the frustration of weak flushes and hello to a cleaner and more efficient toilet.

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