ADS 2708AG8N 8" x 8" Nyloplast Inline Drain. Nyloplast® Light Duty Inline Drains are designed to enter a storm drain line using a tee or elbow and a riser pipe. They represent the latest in storm water piping technology and their innovative combination of performance proven ductile iron grates with a rugged PVC structure makes them unique in the surface drainage industry.