Ultratech 9707-os ultra-pipe sock, oil & sediment, 16in dia x 60inl ultra-pipe socks control the flow of sediment and oil out of headwall and other types of pipes. It is engineered using ultratech’s ultra-x-tex, a durable geo-textile filter media that allows large volumes of water to pass through while absorbing liquid hydrocarbons including petroleum, animal and vegetable oils and other liquid contaminants. also used in pond applications where vertical pipes extend above the water surface and preventing sediment in-flow during high-water events is required. Several standard and custom sizes available. Helps comply with npdes, 40 cfr 122.26 1999 when used as best management practice in storm water pollution prevention plans.