Header laterals design is also available for flat bottom vessel distributor or collector application. System can be designed to accommodate side, center, top or bottom inset piping. Integral backwash systems can be designed for any hub and header lateral for fast effective and efficient cleaning. Connections of the laterals can be flanged or threaded. All systems are designed for effective liquid or solid retention in a wide range of applications including exchangers, clay and filtration applications, carbon towers and power plants with water systems.