Professional plumbers exclusively use food-grade silicone grease (plumber's grease) to lubricate rubber O-rings, seals, stems, and ceramic cartridges during fixture repairs. Unlike petroleum-based lubricants such as Vaseline or standard WD-40, silicone grease is completely waterproof, safe for drinking water lines, and will not degrade, swell, or dissolve rubber and plastic plumbing components over time. Verification: Check that the lubricated O-ring slides smoothly into position without pinching or bunching.
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