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The adjustable catch basin inserts help companies comply with Stormwater Pollution Prevention Plans and Stormwater Best management Practices by protecting your storm drains and catch basins. The Storm Sentinel™ is a sure way to catch oil and sediment headed into storm drains and sewers. 21340 & 21341 trap sediment only while the 21343 & 21344 are equipped with an oil-absorbent packet. The Storm Sentinel guards against any potential discharge. Fits any size rectangular catch basin up to 24” x 36” and round basins up to 24” x 26” Helps comply with NPDES, 40CFR 122.26 (1999) when used as Best Management Practice in Stormwater Pollution Prevention Plans.