GI union is a galvanized iron pipe fitting that joins two pipe sections while allowing for easy disconnection for maintenance or replacement, without damaging the pipes. Made from heavy-duty, corrosion-resistant galvanized iron, GI unions are durable, robust, and designed for high-pressure applications like plumbing, water supply, irrigation, and various industrial systems. They ensure secure, leak-proof connections, are easy to install and remove, and are suitable for conveying water, oil, air, and gas.