Stormwater Drain Seal 900x900mm TSSDS1 (EACH)After personal safety, the first priority when responding to a spill is to keep it on site. The Drain Seal is designed to allow one person to be able to protect critical stormwater drains. After personal safety, the first priority when responding to a spill is to keep it on site. The Drain Seal is designed to allow one person to be able to protect critical stormwater drains. Simply place the Drain Seal over the drain yellow side down. This yellow side