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"Toxin" means any substance of solids, or liquids or <br />gases harmful for human consumption. <br /> <br /> "Vacuum breaker, atmospheric" means a device that <br />consists of a float check, a check seat, and an air inlet <br />port. This unit may never by subjected to a backpressure <br />condition or have a downstream shut off valve, or be installed <br />where it will be in continuous operation for more than twelve <br />(12) hours. <br /> <br /> "Vacuum breaker, pressure type" means an assembly <br />consisting of an independently operating internally loaded <br />check valve, an independently operating loaded air inlet valve <br />located on the discharge side of the check valve, with two (2) <br />properly located test cocks and tightly closing resilient <br />seated shut off valves. <br /> <br />Section 38-169. <br /> <br />General design, installation and <br />maintenance standards for potable water <br />supply system. <br /> <br /> A potable water supply system shall be designed, <br />installed and maintained in such manner as to prevent <br />contamination from nonpotable liquids, solids or gases, either <br />harmful or benign, from being introduced into the potable <br />water supply through cross-connections or any other piping <br />connections to the system. This shall be accomplished by <br />protecting every water outlet from the potable water system <br />which poses a possible cross-connection. Wherever such <br />outlets cannot be protected in accordance with the minimum air <br />gap, a mechanical device shall be utilized to prevent backflow <br />from backsiphonage or backpressure as appropriate according to <br />the degree of hazard. In cases where water usage is <br />sufficiently complex or the severity of the hazard warrants, <br />the director may require an air gap or backflow prevention <br />device immediately downstream from the service connection or <br />at a point approved by the director and the Division. <br /> <br /> <br />