MASSACHUSETTS PLUMBING CODE
EXAM 2025/2026 QUESTIONS AND
ANSWERS 100% PASS
How far can a trap arm go 1 1/2" 2" 3" 4" - ANS 5' 6' 8' 10'
What is the maximum water pressure going into a residential dwelling - ANS 80 psi
What is the smallest drain piping allowed underground - ANS 2"
What's the minimal size vent going through a roof - ANS 2"
How many pounds in a gallon of water - ANS 8.33 lbs
How many gallons in a cubic foot of water - ANS 7.5
How much does a square foot of water weigh - ANS 62.5 lbs
What is the minimal size piping for drainage going through a foundation wall - ANS 4"
What is the minimal size water main underground - ANS 3/4"
1 @COPYRIGHT 2025/2026
,How far should a dwv vent go through the roof - ANS 18-24"
What is the max temp for a shower head - ANS 112 degrees
What is the maximum distance for a common vent at different levels - ANS 10"
What is the minimal liquid trap seal - ANS 2"
What must be stamped on the lip of every S.U. Gasket - ANS ASTM, SV or XH neoprene,
manufactures name
How do you calculate the size of an air gap - ANS It must be at least twice the size of the
diameter of the drain it serves
(into a receptor, sink, floor drain, or inlet side of a trap)
What is the minimal pounds of grease per gallon of flow - ANS 2 pounds
Minimal size water heater that requires a safe pan - ANS 6 gallons
what is the multiplier for a 45 degree offset - ANS Rise x 1.414 = offset
Area of a triangle formula - ANS A=1/2bh (bxh divide by 2)
What temperature does water boil at - ANS 212 degrees Fahrenheit
What temperature does water freeze at - ANS 32 degrees Fahrenheit
2 @COPYRIGHT 2025/2026
, Volume of a rectangle - ANS LxWxH
Volume of a triangular solid - ANS Bxh divided by 2 x L
How many gallons in a fixture unit - ANS 7.5
How many cubic Inches in a gallon - ANS 231"
Psi (gauge pressure) at the base of a column of water - ANS .434 x height in feet
At what temp is water most dense - ANS 39.2 degrees
Volume of a cylinder - ANS V=πr²h ( pi X r squared X height
Where is the vacuum breaker located on a flushometer - ANS After the valve
How do you test a water systems - ANS 125 psi for 15 minutes
How many water closets are allowed on a 3" stack - ANS 3
Pitch for 4" drainage or more per foot - ANS 1/8th per foot
What size letters are on a triangular tag when supplying non potable water - ANS 7/16 inch
If only one stack through the roof what must it be - ANS 3"
What is a fixture unit - ANS Amount of water that can drain through 1 1/4" drain in 60
seconds
3 @COPYRIGHT 2025/2026
EXAM 2025/2026 QUESTIONS AND
ANSWERS 100% PASS
How far can a trap arm go 1 1/2" 2" 3" 4" - ANS 5' 6' 8' 10'
What is the maximum water pressure going into a residential dwelling - ANS 80 psi
What is the smallest drain piping allowed underground - ANS 2"
What's the minimal size vent going through a roof - ANS 2"
How many pounds in a gallon of water - ANS 8.33 lbs
How many gallons in a cubic foot of water - ANS 7.5
How much does a square foot of water weigh - ANS 62.5 lbs
What is the minimal size piping for drainage going through a foundation wall - ANS 4"
What is the minimal size water main underground - ANS 3/4"
1 @COPYRIGHT 2025/2026
,How far should a dwv vent go through the roof - ANS 18-24"
What is the max temp for a shower head - ANS 112 degrees
What is the maximum distance for a common vent at different levels - ANS 10"
What is the minimal liquid trap seal - ANS 2"
What must be stamped on the lip of every S.U. Gasket - ANS ASTM, SV or XH neoprene,
manufactures name
How do you calculate the size of an air gap - ANS It must be at least twice the size of the
diameter of the drain it serves
(into a receptor, sink, floor drain, or inlet side of a trap)
What is the minimal pounds of grease per gallon of flow - ANS 2 pounds
Minimal size water heater that requires a safe pan - ANS 6 gallons
what is the multiplier for a 45 degree offset - ANS Rise x 1.414 = offset
Area of a triangle formula - ANS A=1/2bh (bxh divide by 2)
What temperature does water boil at - ANS 212 degrees Fahrenheit
What temperature does water freeze at - ANS 32 degrees Fahrenheit
2 @COPYRIGHT 2025/2026
, Volume of a rectangle - ANS LxWxH
Volume of a triangular solid - ANS Bxh divided by 2 x L
How many gallons in a fixture unit - ANS 7.5
How many cubic Inches in a gallon - ANS 231"
Psi (gauge pressure) at the base of a column of water - ANS .434 x height in feet
At what temp is water most dense - ANS 39.2 degrees
Volume of a cylinder - ANS V=πr²h ( pi X r squared X height
Where is the vacuum breaker located on a flushometer - ANS After the valve
How do you test a water systems - ANS 125 psi for 15 minutes
How many water closets are allowed on a 3" stack - ANS 3
Pitch for 4" drainage or more per foot - ANS 1/8th per foot
What size letters are on a triangular tag when supplying non potable water - ANS 7/16 inch
If only one stack through the roof what must it be - ANS 3"
What is a fixture unit - ANS Amount of water that can drain through 1 1/4" drain in 60
seconds
3 @COPYRIGHT 2025/2026
