Illinois State Plumbing Exam Latest Update 2025
/ 2026 Questions & Answers with Rationales|
100% Correct | Grade.
1) Chemical substance that does not allow Flux
oxides to form on freshly cleaned copper
before soldering or brazing.
2) Where is an escutcheon ring used? The outside of the stub out
pipe
3) A waste pipe that discharges into and Indirect Waste Pipe
through an approved open connection.
4) Which 2 parts of a trap are used to The crown weir and the top
measure the depth of the trap seal? of the dip of the trap
5) A vent connecting one or more individual Branch Vent
vents with a vent stack.
6) A pipe which make an angle greater than Vertical Pipe
45 degrees from horizontal.
7) Waste system in which all piping is of Durham System
threaded pipe, tube, or other rigid
construction, using recessed drainage
, fittings to correspond to the types of piping
8) Type of faucet that be included or installed Boiler Drain
to drain water from the bottom of a water
heater.
9) Who lists the approved standards for gas ASME
fired storage type water heaters?
10) Before mechanical devices such as 18"
excavators may be used for backfilling pipe
trenches, the trench shall be backfilled in 6"
layers to how many inches above the top
crown of the piping?
11) Piping and fixtures for which standards or Illinois Department of Public
specifications have not been adopted by Health
Code may be installed with who's
permission?
12) The minimum size of a cleanout serving a 4"
4" drain line.
13) The fitting required for making the yoke Wye Branch
vent intersection.
14) The maximum developed length for an 5'
indirect waste to any sanitary waste line.
15) The portion of a fixture drain between a Trap Arm
trap and its vent.
, 16) A fitting used to secure wall-mounted water Carrier Fitting
closets.
17) The side of the of the trap the overflow pipe Inlet Side of the fixture trap
must be connected to.
18) The minimum size of the finished outside of 32"
a shower in a single family home.
19) A process by which a joint is made by Solvent Weld
chemically fusing together a plastic pipe
and a fitting.
20) Tanks flushing more than one urinal require Automatic
what type of operation?
21) A valve which operates by screwing a disc Globe Valve
against a seat.
22) The maximum number of water closets on 2
a 3" horizontal branch drain.
23) A backflow prevention device used in Atmospheric Vacuum
plumbing to prevent backflow of non- Breaker
potable liquids into the drinking water
system.
24) Maximum distance between manholes on 150'
>= 10" underground drainage lines
25) Maximum Drainage Fixture Units allowed 6 DFUs
on a 2" horizontal waste line.
/ 2026 Questions & Answers with Rationales|
100% Correct | Grade.
1) Chemical substance that does not allow Flux
oxides to form on freshly cleaned copper
before soldering or brazing.
2) Where is an escutcheon ring used? The outside of the stub out
pipe
3) A waste pipe that discharges into and Indirect Waste Pipe
through an approved open connection.
4) Which 2 parts of a trap are used to The crown weir and the top
measure the depth of the trap seal? of the dip of the trap
5) A vent connecting one or more individual Branch Vent
vents with a vent stack.
6) A pipe which make an angle greater than Vertical Pipe
45 degrees from horizontal.
7) Waste system in which all piping is of Durham System
threaded pipe, tube, or other rigid
construction, using recessed drainage
, fittings to correspond to the types of piping
8) Type of faucet that be included or installed Boiler Drain
to drain water from the bottom of a water
heater.
9) Who lists the approved standards for gas ASME
fired storage type water heaters?
10) Before mechanical devices such as 18"
excavators may be used for backfilling pipe
trenches, the trench shall be backfilled in 6"
layers to how many inches above the top
crown of the piping?
11) Piping and fixtures for which standards or Illinois Department of Public
specifications have not been adopted by Health
Code may be installed with who's
permission?
12) The minimum size of a cleanout serving a 4"
4" drain line.
13) The fitting required for making the yoke Wye Branch
vent intersection.
14) The maximum developed length for an 5'
indirect waste to any sanitary waste line.
15) The portion of a fixture drain between a Trap Arm
trap and its vent.
, 16) A fitting used to secure wall-mounted water Carrier Fitting
closets.
17) The side of the of the trap the overflow pipe Inlet Side of the fixture trap
must be connected to.
18) The minimum size of the finished outside of 32"
a shower in a single family home.
19) A process by which a joint is made by Solvent Weld
chemically fusing together a plastic pipe
and a fitting.
20) Tanks flushing more than one urinal require Automatic
what type of operation?
21) A valve which operates by screwing a disc Globe Valve
against a seat.
22) The maximum number of water closets on 2
a 3" horizontal branch drain.
23) A backflow prevention device used in Atmospheric Vacuum
plumbing to prevent backflow of non- Breaker
potable liquids into the drinking water
system.
24) Maximum distance between manholes on 150'
>= 10" underground drainage lines
25) Maximum Drainage Fixture Units allowed 6 DFUs
on a 2" horizontal waste line.
