9189PH2CWPPT4Q3

What type of valve must be installed prior to the outlet to protect category 1 water from category 2 contamination?

• Pressure relief valve

• Gate valve

• Single check valve or non-return valve

• Ball valve

Where would a single check valve or non-return valve typically be used in a plumbing system?

• Under a sink

• Under a mixer tap or shower mixer valve

• At the main water supply entrance

• On a drain pipe

What is the purpose of installing a single check valve or non-return valve in plumbing systems?

• To regulate water pressure

• To control the water temperature

• To prevent mechanical backflow

• To filter out impurities

What category of water could contaminate the potable water if the sink were filled to its spillover level?

• Category 1

• Category 2

• Category 3

• Category 4

What is required to be installed to prevent contamination of potable water by backflow in the scenario depicted in the image?

• Single check valve

• Double check valve

• Vacuum breaker

• Air gap

What type of valve must be installed prior to the outlet to protect wholesome water from category 3 water, such as in a filling loop on a combi boiler?

• Pressure relief valve

• Gate valve

• Double check valve or double non-return valve

• Ball valve

Where would a double check valve or double non-return valve typically be used?

• In the main water supply line to a building

• Under a sink with no air gap, on a filling loop for a heating system, or on an outside tap

• Only on indoor plumbing fixtures

• Exclusively in industrial applications

What type of backflow prevention requires a physical air gap to prevent water contamination from non-potable sources?

• Mechanical type

• Non-mechanical type

• Chemical type

• Electronic type

What is the purpose of an air gap in non-mechanical backflow prevention?

• To regulate water pressure

• To measure water flow

• To prevent water from being contaminated by non-potable sources

• To heat the water

Which type of air gap is used in the washbasin shown in the image?

• Type AUK 1

• Type AUK 2

• Type AUK 3

• Type AUK 4