Which of the following criteria does not apply to a 4-inch running trap?

Which of the following criteria does not apply to a 4-inch running trap?

• A. A cleanout on both inlet and outlet side
• B. Grade clean outs must be poured in a 14 by 20 inch concrete pad
• C. Clean outs must be accessible
• D. All of the above

Answer: (B)

A 4-inch running trap, which is typically used in drainage systems, must adhere to specific installation requirements to ensure proper function and accessibility for maintenance. Among the conditions listed, the criterion that a cleanout must be poured in a 14 by 20 inch concrete pad is not a universal requirement for a 4-inch running trap. The main concern for cleanouts is that they must be accessible for service and maintenance, which aligns with the other criteria. While cleanouts can be installed in concrete, the specific dimensions of 14 by 20 inches are not a standard specification across all plumbing codes and may vary depending on local regulations or specific system designs. Thus, while concrete pads can enhance the durability and accessibility of cleanouts, they do not universally dictate the dimensions required. Accessibility and presence of cleanouts at both the inlet and outlet are critical for ensuring that the system can be easily maintained and that blockages can be addressed effectively. Hence, the other criteria ensure that the 4-inch running trap functions correctly and is serviceable as needed.

A 4-inch running trap, which is typically used in drainage systems, must adhere to specific installation requirements to ensure proper function and accessibility for maintenance. Among the conditions listed, the criterion that a cleanout must be poured in a 14 by 20 inch concrete pad is not a universal requirement for a 4-inch running trap.

The main concern for cleanouts is that they must be accessible for service and maintenance, which aligns with the other criteria. While cleanouts can be installed in concrete, the specific dimensions of 14 by 20 inches are not a standard specification across all plumbing codes and may vary depending on local regulations or specific system designs. Thus, while concrete pads can enhance the durability and accessibility of cleanouts, they do not universally dictate the dimensions required.

Accessibility and presence of cleanouts at both the inlet and outlet are critical for ensuring that the system can be easily maintained and that blockages can be addressed effectively. Hence, the other criteria ensure that the 4-inch running trap functions correctly and is serviceable as needed.