Which type of device or fixture receives the discharge from indirect waste pipes?

• A. Traps
• B. Siphons
• C. Gutters
• D. Receptors

Answer: (D)

Indirect waste systems terminate into a receptor rather than discharging directly into the sanitary drain. The receptor is the device or fixture that receives the discharge from indirect waste pipes and then routes it to the drainage system in a controlled way. This distinguishes it from traps (which hold water to block sewer gas), siphons (part of a trap that maintains the water seal), and gutters (which collect surface water). So the term that best fits “what receives the discharge from indirect waste pipes” is receptor.