Final answer:
Receptors for indirect waste piping must be sized and trapped according to local plumbing codes, typically involving an air gap to prevent contamination.
Step-by-step explanation:
All receptors receiving the discharge from indirect waste piping shall be appropriately sized and trapped to prevent the backflow of gases and to ensure that waste material is directed to the sewage system without contaminating the potable water supply. Most plumbing codes will specify that these receptors, also known as indirect waste receptors, must be air-gapped to prevent cross-connection which could lead to contamination.
The size and design will depend on local code requirements and the volume and type of discharge they are meant to handle. It is vital to reference the specific plumbing codes applicable to the jurisdiction where the installation is taking place, as rules can vary significantly from one place to another.