Designed for use on perforated drain pipes, the Drain Sleeve 4 inch x 100 feet filter fabric Sock helps protect underground drainage systems by preventing clogging due to sand and sediment buildup. The fabric sock is great for residential, commercial and agricultural applications. Polyester material provides durabilityDesigned for use on perforated drain pipesHelps protect underground drainage systems by preventing clogging due to sand and sediment buildup