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Grade 304 suits many food and beverage applications. Grade 316L adds molybdenum for better resistance to chlorides and aggressive cleaning agents, and is common in pharmaceutical and fine chemical processes.

All three are sanitary unions that let you disconnect a line without disturbing other pipe work. They differ in standard, thread or clamp design and size range, so unions from different standards are not interchangeable.

Ball valves give tight on-off shut-off and handle high viscosity and high pressure lines. Butterfly valves are compact and economical for larger pipe sizes. Your choice depends on the product, pressure, temperature and cleaning method.