What is not required for indirect waste piping that only receives clear-water waste?

When dealing with indirect waste piping that is designated to handle only clear-water waste, the requirement for a trap is not necessary. This is because a trap serves to prevent odors and gases from escaping into the building; however, if the waste is strictly clear water (which typically does not carry any contaminants that would release harmful gases), the trap is superfluous.

In contrast, a cleanout, access points, and an air gap are vital for ensuring proper drainage, maintenance, and health codes. Cleanouts facilitate the removal of blockages in the system, access points allow for inspection and maintenance, and an air gap is essential to prevent backflow and contamination of potable water supplies. Thus, while the other components play crucial roles in ensuring the system functions effectively and safely, the absence of a trap does not hinder the functionality of the indirect waste piping carrying only clear-water waste.