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UltraTech Ultra-Drain markers. Drain markers help inform and educate the public that most storm drains go directly into waterways untreated. Installs quickly and easily using permanent adhesive - cleaner and more environmentally friendly than paint and stencils. Designed for long life - heavy-duty plastic construction is scratch-resistant and will not rust or corrode. Helps comply with NPDES, 40 CFR 122.26 (1999) when used as best management practice in storm water pollution prevention plans. Size: 3-7/8-inches diameter.