Residential Plumbing Fixtures

Question 1

Lavatory
- What kind of overflow?
- What do you call its FOP?
- What are the 3 different types of FOPs?
- Are shut off valves required?

Answer 1

• Has a concealed overflow
• FOP is referred to as “PO” or Patent Over flow
• 3 Types of POs: Mechanical, Plug and Chain, Strainer
• Shut off valves are not required (but are advised)

Question 2

Kitchen sink
- What is the FOP referred to as?
- What is the peace that connects directly to the sink
- What size must an FOP be when connecting a 3 compartment sink
- What type of over flow is not permitted
- What type of over flow is permitted

Answer 2

Kitchen sink
- FOP is referred to as Continuous waste
- Basket strainer connect directly to the sink
- The FOP connected to a 3 compartment sink must be one size larger then the largest of the 3 drains
- Concealed overflow not permitted
- Standing waste and overflow is permitted

Question 3

Garbage grinder:
- What are the 2 types of garbage grinder
- what shouldn’t they be used for?
- what are they rated in
- how many FU do they have?
- how do you fix a jammed garbage grinder

Answer 3

Garbage grinder
2 Types:
- Continuous feed
- Batch feed
Shouldn’t be used for private sewage disposal (Septic Tanks)
Rated in horsepower
No FU load
If jammed press reset button

Question 4

Water closet
- how tight should the flex be?
- how long is the life span of a flex?
- should you re-use a flex?
- what materials should a toilet be made of

Answer 4

Water closet
- Install flex only hand tight
- Flex has a max life span of 5 years
- Never re-use flex
- Should be smooth, Hard, corrosion resistant: Porcelain, plastic, or SS
- Types ?

Question 5

Bath tub
- what must a tub spout have?
- what is the overflow system called on a tub drain?
- what are jet tubs usually called?
- what is required on a shower head that hangs bellow the flood level rim

Answer 5

Bath tub
- Spout outlet must have a air gap
- Overflow/piping is called Waste and Overflow
- Jet tubs are usually called “Hydromassage Tubs”
- Shower head can’t hang below flood level rim unless it has a dual check valve

Question 6

Showers
- what are thermostatic mixing valves used for?
- a shower that has a 2” drain has how many FU?

Answer 6

Shower
- Thermostatic mixing valves are installed to avoid thermal shock
- 2” drain = 3 FU

Question 7

Bidet
What must a bidet have to prevent backflow?
what is the biggest concern with a bidet?

Answer 7

Bidet
- Must have Atmospheric vacuum breaker (to prevent Backflow)
- Biggest concern is a cross connection (Backflow)

Question 8

Clothes Washer
- How often should you replace the braded flex
- what is the minimum height of a standpipe
- does draining a clothes washer to a laundry tub change the FU of the tub?
- what kind of valves controls a clothes washer?

Answer 8

Clothes Washer
- Replace braided flex every 5 years
- Stand pipe must be a minimum of 600mm
- When draining to a laundry tub it doesn’t change the FU of that tub
- Controlled by a solenoid valve

Question 9

Laundry Sink, Tub and Tray
- What must be installed on the tap?
- How many traps are permitted to protect a 2 compartment laundry sink?

Answer 9

Laundry Sink, Tub and Tray
- Must have a Vacuum Breaker on it
- 1 trap is permitted to protect a 2 compartment laundry tray