The absolute best lubricant for faucet handles, stems, cartridges, and rubber O-rings is food-grade silicone grease (commonly known as plumber's grease). Silicone grease is waterproof, chemically inert, safe for potable drinking water systems, and will not degrade or swell rubber and plastic components like petroleum-based alternatives do, ensuring long-lasting smooth operation for your plumbing fixtures. Verification: Verify that the lubricant tube explicitly states it is 100-percent silicone and designed for plumbing applications.
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