The Hubbell Wiegmann WAS100 1″ Oil-Tight Hole Seal Knockout Plug is a reliable and durable product designed for electrical and industrial applications. This unit, offered by the reputable brand Hubbell, provides a secure seal for 1-inch holes, ensuring a tight fit for conduit and tubing. With its model number WAS100, this knockout plug is a practical solution for businesses and industrial settings looking to maintain a secure and organized electrical system.