The The 2 1/2”- 8” 40/50 Air Gap Assembly will capture and evacuate mild water discharge from the Relieve Valve caused by daily fluctuation in system/supply pressure. Air Gap Assembly will NOT capture and evacuate the maximum discharge caused by catastrophic valve or system failure. An auxiliary drain (separate and independent of the Air Gap Assembly) is REQUIRED and MUST be properly sized for the Maximum Relief Valve Discharge Rate (see specifications below).