... 4.Anti-siphon, Anti-corrosion ♥Anti-siphon Fill valve(inlet valve)♥ 1) Anti-siphon fill valve, pressure stopping design..2) Unique design, not ... sensitive to water quality (polluted water)..3) Compacted design fill valve, small bulk, saving space...4) Suitable for different toilet ... ones).5) Anti-siphon, keeping water from flowing back to inlet pipe..6) Anti-corrosion, long lifespan ensured...7) Steady ...