Manual ball valves for chemicals have wetted components (e.g., stem, valve body) made from materials suitable for chemically compatible media. Valve construction material is important to the intended application and must be compatible with the system media. Always refer to the manufacturer's Chemical Compatibility guide. Manual valves open and close with a handle, which visually indicates whether the valve is open or closed depending on the handle's position relative to the valve body. Two-way valves have one inlet port and one outlet port. Three-way have multiple inlet and outlet ports configured in different flow patterns (e.g., Y, T, or L) for mixing, splitting, or directing media flow.