Backflow Prevention: Introduction and Air Gaps L2

Front

What is the primary purpose of backflow prevention in building plumbing under Water Regulations?

Back

Protect water from contamination within properties

Front

Back siphonage is best described as which process?

Back

Reverse flow caused by negative pressure

Front

An AUK2 air gap is typically required for which risk level and application characteristic?

Back

Medium risk fluids with unrestricted outlets

Front

For an AUK3 air gap, which measuring point defines compliance?

Back

From spillover level to outlet discharge point

Front

Where should the outlet of a float-operated valve (FOV) terminate relative to the water level to prevent contamination?

Back

Above the spillover level with required gap

Front

What is the minimum vertical distance between the tap outlet and the spillover level on a basin using a Type AUK 2 air gap?

Back

20 mm minimum clearance

Front

Which fixture typically requires a larger minimum AUK 2 air gap than a basin?

Back

A bath with standard overflow

Front

What is the minimum AUK 3 air gap height from tap outlet to spillover level for a kitchen sink with a 15 mm bore supply pipe?

Back

25 mm minimum height

Front

Which statement best describes how AUK 2 air gaps are typically set on modern fixtures?

Back

Pre‑set by the manufacturer

Front

What determines the minimum required height for an AUK 3 air gap for a kitchen sink?

Back

Twice the bore of the supply pipe