Lubricating a toilet fill valve requires using the correct type of lubricant to prevent damaging internal rubber and plastic components. Always use a silicone-based plumber grease or silicone spray, and strictly avoid petroleum-based products like WD-40, which cause rubber seals and diaphragms to swell and disintegrate. To apply, shut off the water supply valve, drain the tank, lift the float arm to expose moving plastic pivot points or the valve cap, and apply a thin layer of silicone grease to the friction points. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when handling internal tank parts. Verification: Test the moving float arm up and down to ensure smooth, friction-free movement without sticking.
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