Galvanized Steel Survey Monument Pipe, 1" x 18" Create durable survey monuments, property markers and reference points with this 18-inch galvanized steel pipe . The galvanized finish provides added corrosion resistance for long-term outdoor installation, making it a practical choice for permanent and semi-permanent survey marking applications. Sold individually. Key Features 1" diameter x 18" long steel survey monument pipe. Galvanized finish provides added resistance to corrosion and outdoor exposure. Durable steel construction for permanent and semi-permanent survey marking . Ideal for survey monuments, property markers, control points and construction layout .