A push rod, also known as a duct rodder or fiberglass rod, is a semi-rigid, flexible rod used to "fish" or thread a pull line through conduits, ducts, or raceways. It is typically made of fiberglass and comes on a wheeled reel, allowing it to be pushed into long, curved, or congested spaces where a traditional fish tape might not reach. Its primary purpose is to establish a path for a pulling rope, which is then used to pull the heavier power or communication cables through the conduit. Push rods are indispensable for underground cable laying and for routing wires through walls and ceilings.