The Galvanised Stand Pipe 25mm is threaded on both ends. Used with sprinklers. valves etc. Galvanized steel pipe is a steel pipe that has been coated with zinc. This coating protects the steel from corrosion. It is most commonly used for outdoor construction like fences and handrails, or for some interior plumbing. It is also sometimes called galvanized iron pipe. Used for domestic, agricultural and industrial purposes. Suitable for carrying water, oil and gas. Light oil coating to prevent rust.