The Danco Waterproof Silicone Sealant Grease is ideal for lubricating faucet stems, valves and cartridges when repairing a leaky faucet. Plumbers Faucet and Valve Grease helps reduce friction, provides long-lasting lubrication and helps hard-turning faucets work smoothly. It is NSF 61 approved and meets or exceeds the requirements of FDA regulation 21. Our Silicone Faucet Grease works well in temperatures between -40° to 400° F and can be formulated for many plumbing and household applications. This Silicone Faucet Grease is water resilient and oxidation resistant and can be used on ceramic stems.