ASME A112.1.2 pdf download Air Gaps in Plumbing Systems (For Plumbing Fixtures and Water-Connected Receptors) 1 GENERAL 1.1 Scope This Standard identifies methods of providing protec- tion against backsiphonage through means of an air gap and establishes physical requirements and methods of testing air gaps for plumbing fixtures and water receptors. 1.2 Units of Measurement The values stated in either...