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Lasted about 6 months before the valve started leaking, Verified flapper seats properly. Then replaced it anyway. Tried inspecting, cleaning and flushing the valve seat as per the video. No help. Runs slowly but continuously through the 1/8" plastic refill tube. Then I discovered the following: If the plastic refill tube length extends down lower into the pipe than the full water level, this will create a siphon effect that will make water flow slowly through the refill tube and create the impression of a leaky valve. Do NOT reuse the existing refill tube, even if it appears to be OK. Use the supplied refill tube AND supplied mounting clip, and trim the tube length if needed. This will ensure that the refill tube doesn't siphon the tank and make the valve open. Look in the bowl and ensure that you don't see any water flow. I thin the valve design should prevent this, but it does not.