When multiple outlets are used for a distribution box, how many inches on center can these knockouts be to each other?

When multiple outlets are used for a distribution box, the spacing of the knockouts is designed to ensure proper flow and functionality of the septic system. A spacing of 9 inches on center is typically specified in industry standards. This distance allows for optimal alignment and connection to the laterals or other components of the septic system. It also effectively accommodates the necessary adjustments and variations in installation practices while maintaining efficient distribution of effluent throughout the drain field.

This spacing ensures that the effluent can be evenly distributed, reducing the risk of blockages and promoting effective drainage across the system. Adhering to this measurement is important for compliance with local codes and regulations, which are formulated to protect public health and the environment. Other options, while possibly relevant in different contexts, do not meet the standard spacing requirement appropriate for distributing effluent in a properly functioning septic system.