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Yakima Plumbing License Examination —
Journeyman — Amendments Verified Exam Practice
Questions And Correct Answers (Verified Answers)
Plus Rationale 2026/2027 Q&A| Instant Download Pdf
What type of fitting or fittings can be used to connect
horizontal drainage to another horizontal drainage line? -
Answer-Wye, Combination Wye w/ 1/8 bend, Long sweep
Cleanout locations required by code - Answer-- Each
horizontal drainage pipe shall be provided with a cleat at
its upper terminal
- Horizontal run more than 100'
- Each horizontal change of direction exceeding 135°
- Front Main Cleanout
Maximum distance a cleanup can be spaced apart -
Answer-100'
Minimum clearance in front of a cleanup for 2" or less
Minimum clearance in front of a cleanup for 2" or more -
Answer-12"
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18"
Underfloor cleanup shall not be located more than _____
from an access door, trap door, or crawl hole - Answer-20'
When plumbing fixtures are installed on a floor level lower
than the next upstream manhole cover of the sewer, such
drainage piping shall be protected from backflow of
sewage by a ____________ - Answer-Back Water Valve
Sewage ejectors receiving the discharge of water closets
or ruinals shall have a discharge capacity not less than
___ gallons per minute - Answer-20
What is the minimum size discharge pipe for an ejector
installed in a single dwelling? - Answer-2"
The lowest inlet connected to the ejector pump shall have
a clearance of not less than ____ from the high water or
starting level of the sump. - Answer-2"
Threads of drainage fittings shall be tapped as to allow
_____ pitch per foot - Answer-1/4"
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Lead used for safe pans shall not be less than ________
per square foot - Answer-4 lbs
Name 3 allowable materials for the DWV system
"underground" - Answer-Copper Tube, Cast Iron, Stainless
steel, ABS, PVC DWV
What are the fixture unit values for the following traps -
Answer-1-1/4" - 1 dfu's
1-1/2" - 3 dfu's
2" - 4 dfu's
3" 6 dfu's
4" - dfu's
What type of fitting is used for continuous waste and
venting of lavatories back to back? - Answer-Double
fixture fitting
Caulk joints for cast iron bell and spigot shall be filled with
molten lead to a depth of not less than ________? -
Answer-1"
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Can macerating toilet systems be installed instead of a
sewage pump system - Answer-Yes, with prior approval of
the AHJ
What is the minimum size discharge pipe for a macerating
toilet system - Answer-3/4"
What is the minimum pitch required fora 2" horizontal
drain? - Answer-1/4" per foot
The discharge line from an ejector pump shall be provided
with an accessible ___________ and gate or ball valve. -
Answer-Swing check valve
Where shall the gate valve be located on the discharge
line on an ejector pump - Answer-Downstream of the
backwater valve
Drainage connections shall not be made into a drainage
piping system within ________ of an vertical or horizontal
change in direction of a stack containing suds producing
fixtures. - Answer-8'
Yakima Plumbing License Examination —
Journeyman — Amendments Verified Exam Practice
Questions And Correct Answers (Verified Answers)
Plus Rationale 2026/2027 Q&A| Instant Download Pdf
What type of fitting or fittings can be used to connect
horizontal drainage to another horizontal drainage line? -
Answer-Wye, Combination Wye w/ 1/8 bend, Long sweep
Cleanout locations required by code - Answer-- Each
horizontal drainage pipe shall be provided with a cleat at
its upper terminal
- Horizontal run more than 100'
- Each horizontal change of direction exceeding 135°
- Front Main Cleanout
Maximum distance a cleanup can be spaced apart -
Answer-100'
Minimum clearance in front of a cleanup for 2" or less
Minimum clearance in front of a cleanup for 2" or more -
Answer-12"
,2|Page
18"
Underfloor cleanup shall not be located more than _____
from an access door, trap door, or crawl hole - Answer-20'
When plumbing fixtures are installed on a floor level lower
than the next upstream manhole cover of the sewer, such
drainage piping shall be protected from backflow of
sewage by a ____________ - Answer-Back Water Valve
Sewage ejectors receiving the discharge of water closets
or ruinals shall have a discharge capacity not less than
___ gallons per minute - Answer-20
What is the minimum size discharge pipe for an ejector
installed in a single dwelling? - Answer-2"
The lowest inlet connected to the ejector pump shall have
a clearance of not less than ____ from the high water or
starting level of the sump. - Answer-2"
Threads of drainage fittings shall be tapped as to allow
_____ pitch per foot - Answer-1/4"
,3|Page
Lead used for safe pans shall not be less than ________
per square foot - Answer-4 lbs
Name 3 allowable materials for the DWV system
"underground" - Answer-Copper Tube, Cast Iron, Stainless
steel, ABS, PVC DWV
What are the fixture unit values for the following traps -
Answer-1-1/4" - 1 dfu's
1-1/2" - 3 dfu's
2" - 4 dfu's
3" 6 dfu's
4" - dfu's
What type of fitting is used for continuous waste and
venting of lavatories back to back? - Answer-Double
fixture fitting
Caulk joints for cast iron bell and spigot shall be filled with
molten lead to a depth of not less than ________? -
Answer-1"
, 4|Page
Can macerating toilet systems be installed instead of a
sewage pump system - Answer-Yes, with prior approval of
the AHJ
What is the minimum size discharge pipe for a macerating
toilet system - Answer-3/4"
What is the minimum pitch required fora 2" horizontal
drain? - Answer-1/4" per foot
The discharge line from an ejector pump shall be provided
with an accessible ___________ and gate or ball valve. -
Answer-Swing check valve
Where shall the gate valve be located on the discharge
line on an ejector pump - Answer-Downstream of the
backwater valve
Drainage connections shall not be made into a drainage
piping system within ________ of an vertical or horizontal
change in direction of a stack containing suds producing
fixtures. - Answer-8'
