AIRGAP的作用是防止SINK里的水倒灌至DISHWASHER。
相关的CODE(UPC 807.4):
No domestic dishwashing machine shall be connected directly to a drainage system or food waste disposer without the use of an approved dishwasher airgap fitting on the discharge side of the dishwashing machine. Listed airgaps shall be installed with the flood level marking at or above the flood level of the sink or drainboard, whichever is higher.
AIRGAP的位置
没有AIRGAP或HIGH LOOP时，水会倒灌。
