1″ ID (inside diameter) 1″ F.I.P. x 1″ F.I.P. x 18″ water heater connector. Braided stainless steel wrapped around reinforced braided PVC with brass hex connector nuts. Approved for residential, commercial, and industrial applications for water supply connections to fixtures. Core is Virgin PVC with polyester yarn braiding over-braided with stainless steel 304 for strength and durability. Chrome plated brass nuts and washers for a dependable hand-tight seal. Max Temp 180F (degrees Fahrenheit); Max Pressure: 125 psi ( pounds per square inch). IAPMO (International Association of Plumbing and Mechanical Officials) listed.