Plumber Red Seal · Question
What is the purpose of an air admittance valve (AAV)?
An air admittance valve allows air to enter the drainage system when negative pressure develops, preventing trap siphonage. It seals to prevent sewer gases from
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
Question: What is the purpose of an air admittance valve (AAV)?
Answer options:
- To prevent sewer gases from entering the building ✅ To allow air into the drainage system when negative pressure occurs
- To discharge wastewater directly outdoors
- To increase water pressure in the supply system
Correct answer: To allow air into the drainage system when negative pressure occurs
Explanation: An air admittance valve allows air to enter the drainage system when negative pressure develops, preventing trap siphonage. It seals to prevent sewer gases from escaping when pressure is equalized or positive.
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
More about Plumber Red Seal
Related Questions
- Before starting a new plumbing installation in a residential basement, what is the primary reason why a plumbe
- A plumber is installing a new kitchen sink in an existing residential dwelling. The sink drain is connected to
- A plumber is installing drainage for a dishwasher in a residential kitchen. The dishwasher P-trap is located 1
- A plumber is asked to install a backflow prevention assembly on a lawn irrigation system connected to the pota
- A plumber is considering the velocity of water in a 50 mm (2") copper pipe supplying a commercial building. Ex
- A plumber is designing the domestic hot water recirculation system for a multi-story residential building. Wha
More for Plumber Red Seal candidates
Practice tests
Question explanations
- Before starting a new plumbing installation in a residential basement, what is the primary reason why a plumbe
- A plumber is installing a new kitchen sink in an existing residential dwelling. The sink drain is connected to
- A plumber is installing drainage for a dishwasher in a residential kitchen. The dishwasher P-trap is located 1
- A plumber is asked to install a backflow prevention assembly on a lawn irrigation system connected to the pota
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Plumber Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.