not be directly connected to the drainage system to prevent backflow of potentially contaminating the potable water. discharge to a floor drain, to an indirect waste receptor, or to the outdoors.not be trapped, since standing water may become contaminated and backflow into the potable water.be installed so as to drain by flow of gravity.be as short and as straight as possible so as to avoid undue stress on the valve.not reduce in size from the valve to the air gap (point of discharge).not be smaller than the diameter of the outlet of the valve it serves (usually no smaller than 3/4"). PVC and other non-approved plastics should not be used since they can easily melt.
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