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， but this waterproof grease is a perfect lubricant on your faucet or valve stems.