Replace your Dura Slope plastic grates with galvanized grates.
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Galvanized slotted grate for the NDS® Dura Slope trench drain system. Recommended for medium-duty pneumatic tire traffic, autos and light trucks at speeds less than 20 mph. Class B Load Rating: 61-175 psi.
Locking Devices (2 per grate) sold separately: NDS-629 & DS-122