Shop Low Prices on: HydroWorks Toilet Fill Valve Fill Valve | Toilet Fill Valves | Dual Flush Valves for Water Saving Toilets Small constructure, big water momentum; Dual-bar to adjust the water level; water refill adjusted by different plug — Adjusting the height of float to adjust the water level;— Fill vale height can be adjusted as per the tank heights, accordingly, water level is controled.— ...