This is the official product video for the Norwesco 18 Inch Lid with Vent. Full specifications, dimensions, and live pricing are on the product page.
The Norwesco N-64448 is an 18 inch threaded lid with a vent... molded in black polypropylene. It threads onto an 18 inch access opening, and the built-in vent lets air move in and out as the level rises and falls... so the opening is not sealed shut during normal filling and draw-down. At about 18 inches across and 4 inches tall, it seats over the 18 inch opening it is sized for. The lid is polypropylene throughout and is roughly 5 pounds—light enough to install and remove by hand. Model-matched lids are not interchangeable across different opening sizes. Norwesco 18 Inch Lid with Vent — VENTED SECURE SEAT. OneSource Plastics.