Zero-Leak port plugs offer an economical and practical solution to achieve a leak-free performance. They employ a dual-method approach to ensure a completely leak-free seal. The tapered plug forms a metal-to-metal seal by making contact with the port taper. A small-diameter O-ring is positioned between the plug taper and the threads, serving as a secondary seal. The socket-head design facilitates easy installation and removal of the port plug. Constructed from ductile iron and featuring a zinc chromate plating, these plugs are resistant to oxidation and corrosion. This robust design ensures their long-lasting performance across a diverse range of environments.