3717-1-05.1(J) / Backflow prevention device - when required.
Critical Observed no air gap or approved backflow prevention device on the plumbing system. Observed a hose connected to the faucet of the mop sink that was not properly protected with a backflow prevention device.
A plumbing system shall be installed to preclude backflow of a solid, liquid, or gas contaminant into the water supply system of use at the FSO or RFE, by providing an air gap as specified under this rule, or installing an approved backflow prevention device as specified under this rule. To protect the drinking water system from potential contamination due to backflow, properly install a backflow prevention device that meets the American Society of Sanitary Engineering (ASSE) standards.