Air gap fittings must comply with which of the following standards?

Air gap fittings are critical in plumbing systems as they prevent backflow and ensure that contaminated water does not enter clean water supplies. The correct standard for air gap fittings is ASME A112.1.3, which specifically outlines the requirements for these fittings. This standard provides guidelines regarding the design, performance, testing, and installation of air gap fittings to ensure they provide a physical separation between the potable water supply and the non-potable system, thus maintaining water quality and safety.

Compliance with ASME A112.1.3 ensures that air gap fittings meet necessary health and safety standards. This includes specifications on how the gaps should be constructed, maintaining appropriate distances to prevent siphoning or backflow.

The other standards mentioned focus on different aspects or types of plumbing devices and are not applicable to air gap fittings specifically, which is why they do not apply in this case. Understanding which standards are relevant to specific plumbing components is essential for ensuring compliance and maintaining safe drinking water systems.