Fluidmaster Fill Valve

Is this normal? I just replaced my old float fill valve with a Fluidmaster fill valve that does not float.

Your valve may be defective.

could be that the valve ball valve at the bottom of the water tank is leaking snd lower the water level. the filling valve is to replace the water level is appropriate.
Replace the flapper ball

Check if this is the style that can be adjusted. If I remember on some versions, you can tighten the cap down. This should not leak. If he cannot then tightened it back for a replacement. If this is a normal filling operation, so you have a leak in the valve.

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