(3 pcs) The product is a 2" NPS HDPE replacement bung with a 3/4" knockout center and an EPDM gasket. It is designed for non-vented use. This bung is suitable for storage bottles, drums, and pails, and it falls under the category of material handling in the business and industrial sector. The NPS brand ensures quality and reliability for your storage needs. A "nps 2\" bung" refers to a bung plug or adapter with a 2-inch National Pipe Straight (NPS) thread, which is a type of coarse thread commonly found on 55-gallon drums and other containers. It is used to seal the opening of the container and can also serve as an adapter to secure items like pumps. The specific product will depend on its material (like steel, polyethylene, or polypropylene) and its intended use (e.g., a simple plug, a pump adapter, or a cap with a smaller knockout center)