Loc-Line Coolant Hose Component, Acetal Copolymer, In-Line Valve, 1/2" Hose ID, 20 PSI (Pack of 2) Valve to regulate the flow of coolant or air Fitting connects to Loc-Line modular hose on both ends Acetal copolymer plastic has orange and blue colors, resists corrosion and moisture, and can be used with acetone, alcohol, ethyl, greases, oils, commercial dish detergents, gasoline, lacquer solvents, and sodium hydroxide Maximum operating temperature of 170 degrees F Material meets NSF/ANSI standards 14, 51, and 61 for drinking (potable) water