Two-way brass general purpose pneumatic ball valves are made from a corrosion-resistant copper and zinc alloy less prone to cracking than plastic valves. These valves have one inlet and one outlet port, and they control the flow of compatible media, such as water, steam, oil, air, and inert gas, in various industrial and commercial applications. Pneumatic-actuated valves use compressed air to open and close. They have a higher closing force than electric-actuated valves and are suited for systems moving viscous liquids.