ULTRA DRAIN GUARDKeep sediment, hydrocarbons and other pollutants out of the stormwater system. Large sediment accumulation pocket holds up to 18kg of silt, sediment and rubbish as well as 3. 5L of oil and grease. Built in overflow ports avoid flooding in heavy rain events. Sewn in, lift out straps make removal easy and prevent the Drain Guard from falling into the inlet. One size fits most drains. Simply lift grate, insert Drain Guard and replace grate to hold Drain