Non-rusting Brite-Tread aluminum. BriteGard powder-coated finish. Radius curve design eliminates weld pressure points. 3 stability baffles and drain plug. Cap and coupler for venting. Product Features:Non-Rusting Brite-Tread AluminumProtective Black Powder-Coat FinishRadius Curve Eliminates Weld Pressure Points3 Stability Baffles and Drain PlugCap and Coupler for Venting