ILLINOIS STATE PLUMBING REVIEW 2026
QUESTIONS AND ANSWERS SURE A+
✔✔Maximum DFU's for a Horizontal Branch
1 1/4"
1 1/2"
2"
3"
4" - ✔✔1 1/4" = 1 DFU
1 1/2" = 3 DFU
2" = 6 DFU
3" = 20 DFU
4" = 100 DFU
✔✔Maximum Distance Allowed from Fixture Trap to Vent
1 1/4"
1 1/2"
2"
3"
4" - ✔✔1 1/4" = 2 Feet 6 Inches
1 1/2" = 3 Feet 6 Inches
2" = 4 Feet
3" = 5 Feet
4" = 6 Feet
✔✔If the rate of flow is doubled in any given size water pipe, the pressure loss will
increased by how many times? - ✔✔4x
✔✔What is the definition of "Water Service Pipe?" - ✔✔Pipe extending from the water
main to the building
✔✔At what distance shall all large water heaters have a union within? - ✔✔5 Feet
, ✔✔The length of flush on a piston type flush valve can be adjusted in what way? -
✔✔Externally
✔✔What is the name of the section of piping at the lowest point of the drainage system
which receives the discharge from soil, waste, and other drainage pipes inside the walls
of the building? - ✔✔Building Drain
✔✔All types of backflow devices shall be field tested by what type of professional? -
✔✔Certified Backflow Tester
✔✔A bidet shall be equipped with what types of water? - ✔✔Hot and Cold, Tempered
and Cold, or Tempered Only
✔✔Where must a pump be installed on a whirlpool type bath tub? - ✔✔Above the weir
of the tub trap
✔✔Building sewers or sanitary sewers may only be installed within 10' of well when
what type of piping is installed? - ✔✔Cast Iron Pipe with Mechanical Joints or SCH40
PVC with Solvent Welded Joints
✔✔What is the minimum pipe size of any combination waste and vent drainage line? -
✔✔4"
✔✔What is the primary function of the venting system? - ✔✔To protect trap seals from
back-pressure and siphonage
✔✔In what type of plumbing fixture may a magnesium rod be installed? - ✔✔Storage
Type Water Heater
✔✔All shower and shower/baths must be provided with what type of device? - ✔✔A
Thermostastic, Pressure Balance, or Combination Controlled Mixing Valve
✔✔What is the term for the measured length along the center line of the pipe and its
fittings? - ✔✔Developed Length
✔✔What fitting is acceptable for connecting 2 horizontal drain lines? - ✔✔Combination
Wye and 1/8 Bend
✔✔What is the minimum vent size for a 4" trap? - ✔✔2"
✔✔What is required for a water piping system with a pressure exceeding 80 psi? -
✔✔Pressure Reducing Valve
QUESTIONS AND ANSWERS SURE A+
✔✔Maximum DFU's for a Horizontal Branch
1 1/4"
1 1/2"
2"
3"
4" - ✔✔1 1/4" = 1 DFU
1 1/2" = 3 DFU
2" = 6 DFU
3" = 20 DFU
4" = 100 DFU
✔✔Maximum Distance Allowed from Fixture Trap to Vent
1 1/4"
1 1/2"
2"
3"
4" - ✔✔1 1/4" = 2 Feet 6 Inches
1 1/2" = 3 Feet 6 Inches
2" = 4 Feet
3" = 5 Feet
4" = 6 Feet
✔✔If the rate of flow is doubled in any given size water pipe, the pressure loss will
increased by how many times? - ✔✔4x
✔✔What is the definition of "Water Service Pipe?" - ✔✔Pipe extending from the water
main to the building
✔✔At what distance shall all large water heaters have a union within? - ✔✔5 Feet
, ✔✔The length of flush on a piston type flush valve can be adjusted in what way? -
✔✔Externally
✔✔What is the name of the section of piping at the lowest point of the drainage system
which receives the discharge from soil, waste, and other drainage pipes inside the walls
of the building? - ✔✔Building Drain
✔✔All types of backflow devices shall be field tested by what type of professional? -
✔✔Certified Backflow Tester
✔✔A bidet shall be equipped with what types of water? - ✔✔Hot and Cold, Tempered
and Cold, or Tempered Only
✔✔Where must a pump be installed on a whirlpool type bath tub? - ✔✔Above the weir
of the tub trap
✔✔Building sewers or sanitary sewers may only be installed within 10' of well when
what type of piping is installed? - ✔✔Cast Iron Pipe with Mechanical Joints or SCH40
PVC with Solvent Welded Joints
✔✔What is the minimum pipe size of any combination waste and vent drainage line? -
✔✔4"
✔✔What is the primary function of the venting system? - ✔✔To protect trap seals from
back-pressure and siphonage
✔✔In what type of plumbing fixture may a magnesium rod be installed? - ✔✔Storage
Type Water Heater
✔✔All shower and shower/baths must be provided with what type of device? - ✔✔A
Thermostastic, Pressure Balance, or Combination Controlled Mixing Valve
✔✔What is the term for the measured length along the center line of the pipe and its
fittings? - ✔✔Developed Length
✔✔What fitting is acceptable for connecting 2 horizontal drain lines? - ✔✔Combination
Wye and 1/8 Bend
✔✔What is the minimum vent size for a 4" trap? - ✔✔2"
✔✔What is required for a water piping system with a pressure exceeding 80 psi? -
✔✔Pressure Reducing Valve
