Massachusetts Plumbing Code Exam Practice
Questions and Answers Latest 2025 Graded A+
Where is the vacuum breaker located on a flushometer - CORRECT ANSWER-After the
valve
How do you test a water systems - CORRECT ANSWER-125 psi for 15 minutes
How many water closets are allowed on a 3" stack - CORRECT ANSWER-3
,Pitch for 4" drainage or more per foot - CORRECT ANSWER-1/8th per foot
What size letters are on a triangular tag when supplying non potable water - CORRECT
ANSWER-7/16 inch
If only one stack through the roof what must it be - CORRECT ANSWER-3
How far can a trap arm go 1 1/2" 2" 3" 4" - CORRECT ANSWER-5' 6' 8' 10'
What is the maximum water pressure going into a residential dwelling - CORRECT
ANSWER-80 psi
What is the smallest drain piping allowed underground - CORRECT ANSWER-2"
What's the minimal size vent going through a roof - CORRECT ANSWER-2"
How many pounds in a gallon of water - CORRECT ANSWER-8.33 lbs
, How many gallons in a cubic foot of water - CORRECT ANSWER-7.5
How much does a square foot of water weigh - CORRECT ANSWER-62.5 lbs
What is the minimal size piping for drainage going through a foundation wall - CORRECT
ANSWER-4"
What is the minimal size water main underground - CORRECT ANSWER-3/4"
How far should a dwv vent go through the roof - CORRECT ANSWER-18-24"
What is the max temp for a shower head - CORRECT ANSWER-112 degrees
What is the maximum distance for a common vent at different levels - CORRECT
ANSWER-10"
What is the minimal liquid trap seal - CORRECT ANSWER-2"
What must be stamped on the lip of every S.U. Gasket - CORRECT ANSWER-ASTM, SV or
XH neoprene, manufactures name
Questions and Answers Latest 2025 Graded A+
Where is the vacuum breaker located on a flushometer - CORRECT ANSWER-After the
valve
How do you test a water systems - CORRECT ANSWER-125 psi for 15 minutes
How many water closets are allowed on a 3" stack - CORRECT ANSWER-3
,Pitch for 4" drainage or more per foot - CORRECT ANSWER-1/8th per foot
What size letters are on a triangular tag when supplying non potable water - CORRECT
ANSWER-7/16 inch
If only one stack through the roof what must it be - CORRECT ANSWER-3
How far can a trap arm go 1 1/2" 2" 3" 4" - CORRECT ANSWER-5' 6' 8' 10'
What is the maximum water pressure going into a residential dwelling - CORRECT
ANSWER-80 psi
What is the smallest drain piping allowed underground - CORRECT ANSWER-2"
What's the minimal size vent going through a roof - CORRECT ANSWER-2"
How many pounds in a gallon of water - CORRECT ANSWER-8.33 lbs
, How many gallons in a cubic foot of water - CORRECT ANSWER-7.5
How much does a square foot of water weigh - CORRECT ANSWER-62.5 lbs
What is the minimal size piping for drainage going through a foundation wall - CORRECT
ANSWER-4"
What is the minimal size water main underground - CORRECT ANSWER-3/4"
How far should a dwv vent go through the roof - CORRECT ANSWER-18-24"
What is the max temp for a shower head - CORRECT ANSWER-112 degrees
What is the maximum distance for a common vent at different levels - CORRECT
ANSWER-10"
What is the minimal liquid trap seal - CORRECT ANSWER-2"
What must be stamped on the lip of every S.U. Gasket - CORRECT ANSWER-ASTM, SV or
XH neoprene, manufactures name
