ASME A112.1.2 pdf download Air Gaps in Plumbing Systems (For Plumbing Fixtures and Water-Connected Receptors) 1GENERAL1.1 Scope This Standard identifies methods of providing protec-tion against backsiphonage through means of an air gapand establishes physical requirements and methods oftesting air gaps for plumbing fixtures and waterreceptors. 1.2 Units of Measurement The values stated in either SI (Metric) or inch/poundunits are to...