| A  toilet fill tube, otherwise known as a fill valve, is the key component inside  a toilet tank that facilitates its normal operation. Over time the fill valve  can wear or become loose, sometimes requiring minor toilet repair and other  times requiring a full replacement. New fill valves are not expensive nor are  they hard to install, as long as you exercise the proper caution.
 With the old assembly removed you should be able to easily insert the new fill  valve into place in the same location. Slide the tube through the hole where  the old part was removed, and retighten the nut that secures it underneath the  tank. Some fill valve assemblies are adjustable, and if this is the case with  yours, you will need to make sure it is adjusted to the correct height for your  particular toilet tank. After the valve is replaced, turn on the water before  replacing the lid to the tank.
 
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