THE STORM SENTINEL™ DRAIN PROTECTION INSERTS HELP COMPANIES COMPLY WITH STORMWATER POLLUTION PREVENTION PLANS AND STORMWATER BEST MANAGEMENT PRACTICES BY PROTECTING YOUR STORM DRAINS AND CATCH BASINS. IT IS THE SURE WAY TO CATCH TRASH DEBRIS AND SEDIMENT HEADED INTO STORM DRAINS AND SEWERS. ENPAC'S ENHANCED DESIGN HAS INCREASED THE SURFACE AREA FOR GREATER SEDIMENT RETENTION WHILE DECREASING THE DEPTH OF THE UNIT IN THE CATCH BASIN. LARGE RECTANGLE INSERTS ARE ADJUSTABLE TO FIT CATCH BASIN'S FROM 16""X 20"" TO 28""X 36"" (41CM X 51CM TO 71CM X 97CM). UP TO 500 GPM OVERFLOW RATE HELPS AVOID PONDING. REQUIRES NO SPECIAL TOOLS TO INSTALL. HELPS COMPLY WITH NPDES 40 CFR 122.26 WHEN USED AS BEST MANAGEMENT PRACTICE IN STORM WATER POLLUTION PREVENTION PLANS. TO INSTALL REMOVE GRATE AND ADJUST WIRE FRAME TO FIT IN RECESS. PLACE INSERT INTO RECESS AND FRAME INTO CORNERS. REPLACE METAL GRATE. TO REMOVE LIFT THE GRATE GRAB THE HANDLE AND PULL OUT THE INSERT. NO PART OF THE INSERT EXTENDS ABOVE THE SURFACE .