§ 18.73. Backflow prevention.
(a) Backflow is not permitted. A potable water distributing pipe is considered as protected against backflow from a plumbing fixture or other piece of equipment or from an appliance capable of affecting the quality of the water in the potable water supply where an air gap of at least twice the diameter of the water supply pipe has been provided.
(b) Where it is not practicable to provide the minimum air gap, the connection to the fixture, equipment or appliance shall be equipped with a backflow preventer assembly of a type and at a location approved by the Department.
(c) The Department may require that a backflow preventer assembly of a type and location approved by the Department be installed at a fixed potable water outlet to which a hose may be connected and used in contact with liquids or other substances.
The provisions of this § 18.73 adopted September 18, 1971, effective September 18, 1971, 1 Pa.B. 1921.
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