Plumber Red Seal · Question
What is the minimum size of a trap arm connecting a water closet to a soil stack?
A water closet typically requires a 3-inch (75 mm) trap arm. This size is necessary to handle the volume and type of waste from a toilet effectively and prevent
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
Question: What is the minimum size of a trap arm connecting a water closet to a soil stack?
Answer options:
- 1½ inches (38 mm)
- 2 inches (50 mm) ✅ 3 inches (75 mm)
- 4 inches (100 mm)
Correct answer: 3 inches (75 mm)
Explanation: A water closet typically requires a 3-inch (75 mm) trap arm. This size is necessary to handle the volume and type of waste from a toilet effectively and prevent clogging.
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.