These das storm drain markers can be permanently applied to concrete, asphalt or metal with das adhesive. Permanently mark storm drains with “no dumping” messages. The company offers 28 stock titles in three different finishes. Custom storm drain markers can be made in a variety of shapes, sizes and materials, and they can be numbered or UPC or QR encoded. Over 20 million of these products have been sold since 1983. They are easy to use and suitable for volunteers.