New Pig Drain Insert, Removes Oil, Sediment, For Use With Storm Drains, 36 in Length, 48 in Width - FLT116 Multifold flow controls

flow controls

There's also a moisture-resistant sealant between the frame and the endbells

Conveniently refillable with liquid soap (see spec sheet for requirements)

BUBBLER ASSEMBLY

New Pig Drain Insert, Removes Oil, Sediment, For Use With Storm Drains, 36 in Length, 48 in Width - FLT116 Multifold flow controlsThis PIG Drain Insert Plus is an easy way to control oily runoff and sediment and helps to avoid stormwater fines. Below grate design stays intact in areas with high vehicle traffic. 18 in. deep accumulation pocket collects oil, sediment, and other contaminants, but lets water flow through. Features 3 excess flow ports to prevent blockage during high water flow. Filter strips made from recycled fibers remove floating oil and other hydrocarbons. Trim