The Danco Waterproof Grease is designed for use as a lubricant for faucets and valve stems. This grease also works good as an installation aid, for inserting parts that will be making a seal and will not be moving again. It is NSF 61 approved and meets or exceeds the requirements of FDA regulation 21. This grease works well in temperatures between -40° to 400° F. Faucet grease can be formulated for many plumbing applications, and is a perfect lubricant on your faucet or valve stems. Silicone Faucet Grease helps reduce friction and provides long-lasting lubrication. The grease is water resilient and oxidation resistant. It can be used on ceramic stems.