Residential Sewer Line Installation Quiz

What is the maximum number of toilets a residential house can have before requiring a four-inch pipe?

• Five

• Two

• Three

• Four

What is the purpose of a backwater valve in a sewer line?

• To reduce the pipe size

• To prevent water from flowing back into the house

• To filter the water

• To increase water pressure

When is a backwater valve required according to code?

• When the sewer line is longer than 100 feet

• When the finished floor is higher than the manhole rim elevation

• When the finished floor is lower than the next downstream manhole rim elevation

• When there are more than three toilets in the house

Why should you avoid hub-on-hub connections in sewer lines?

• They can cause leaks

• They are more expensive

• They are not allowed by code

• They are difficult to install

What is the recommended height for a cleanout riser before landscaping is completed?

• Just above ground level

• As high as possible

• Slightly below ground level

• At ground level

How should the bell end of a pipe be oriented when running a sewer line?

• Pointed upwards

• Pointed downwards

• Pointed towards the house

• Pointed away from the house

What is the maximum distance allowed between cleanouts in a sewer line?

• 100 feet

• 75 feet

• 50 feet

• 150 feet

What is the purpose of an elder valve in a sewer system?

• To shut off the sewer if the bill is unpaid

• To increase water flow

• To filter the sewage

• To prevent backflow

What type of fitting is used to transition from horizontal to vertical in a sewer line?

• Sanitary tee

• Reducer

• Coupling

• 45-degree elbow

What is the correct use of a sanitary tee in a sewer line?

• Vertical to vertical

• Horizontal to horizontal

• Horizontal to vertical

• Vertical to horizontal