MASTER PLUMBING 2026 STUDY GUIDE QUESTIONS AND
SOLUTIONS RATED A+
✔✔All water service pipe or tubing shall have a minimum working pressure rating of
____ PSI. - ✔✔160
✔✔The ASSE standard reference number for water hammer arrestors is? - ✔✔1010-98
✔✔Traps shall have a liquid seal of not less than ___ inches - ✔✔2"
✔✔An 8 inch sewer requires a cleanout not less than ____ inches in diameter. - ✔✔4
✔✔Cleanouts shall be installed on sewers where the direction changes by greater than
_____ degrees. - ✔✔45
✔✔A vent going up through a rooftop deck of partio shall extend ___ feet above the
roof. - ✔✔7
✔✔Vent piping shall be no smaller than ___ inches - ✔✔1 1/4
✔✔Vents over ____ feet in developed length shall be increased one size for the entire
length. - ✔✔40
✔✔You are helping your friend design the plumbing system for a nursing home which
will "hold" 60 people. How many bathtub/showers must you design into the system? -
✔✔4
✔✔Floor drains shall have a minimum diameter of ___ inches - ✔✔2"
✔✔According to the WSSC PFGC, water piping in exterior walls shall be protected by a
minimum _______ insulation on the "cold" side of the piping and no insulation on the
warm side. - ✔✔R-24
✔✔A backflow technician license shall be valid for a period of ____ years. - ✔✔3
✔✔According to the IPC, the combined hot and cold water supply fixture unit value for a
half bath group is _____. - ✔✔2.9
✔✔A copper tee which is 1 inch straight-through with 1/2" as the side outlet is called a
_________ tee. - ✔✔1 x 1 x 1/2
✔✔Turning the screw clockwise (inwards) on a house pressure reducing valve will do
what? - ✔✔raise the water pressure
, ✔✔Which of the following is the best material to seal a faucet to a sink deck? -
✔✔100% pure silicone
✔✔Which of the following jobs does not require a WSSC permit? - ✔✔replace electric
water heater
✔✔A hole is dug 9' deep, 3 feet wide and 12 feet long. How many cubic yards is this? -
✔✔12
✔✔According to the IPC, the temperature of water from tankless water heaters shall be
a maximum of _______ *F when for domestic use. - ✔✔140
✔✔According to the WSSC PFGC., building sewers, other than those for private
sewage disposal systems, shall be ____ inches below grade - ✔✔24
✔✔According to the WSSC PFGC, the maximum depth from finished grade to the curb
valve on a water service shall be ___ inches. - ✔✔60
✔✔According to the WSSC PFGC, installation of a jumper on a water meter rack is
_____. - ✔✔prohibited
✔✔ Waste water discharged into the building drainage system shall not be over
_______ *F - ✔✔140
✔✔A water tank holds 50 gallons of water. How much does the 50 gallons of water
weigh? - ✔✔417 lbs
✔✔Exterior walls may be notched to a depth exceeding _______________ percent of
its width. - ✔✔25
✔✔According to the WSSC PFGC, a full flow building water service valve shall be
installed within _____ feet of where the water service enters the building. - ✔✔3'
✔✔According to the WSSC PFGC, water meters installed inside of buildings shall be
located in an area capable of maintaining _____ *F. - ✔✔50
✔✔In Prince George and Montgomery County, water service piping shall be not less
than _____ inches below grade. - ✔✔30
✔✔A cylindrical tank is 22 inches in diameter and 5 feet tall. How many gallons of water
will it hold? - ✔✔98
SOLUTIONS RATED A+
✔✔All water service pipe or tubing shall have a minimum working pressure rating of
____ PSI. - ✔✔160
✔✔The ASSE standard reference number for water hammer arrestors is? - ✔✔1010-98
✔✔Traps shall have a liquid seal of not less than ___ inches - ✔✔2"
✔✔An 8 inch sewer requires a cleanout not less than ____ inches in diameter. - ✔✔4
✔✔Cleanouts shall be installed on sewers where the direction changes by greater than
_____ degrees. - ✔✔45
✔✔A vent going up through a rooftop deck of partio shall extend ___ feet above the
roof. - ✔✔7
✔✔Vent piping shall be no smaller than ___ inches - ✔✔1 1/4
✔✔Vents over ____ feet in developed length shall be increased one size for the entire
length. - ✔✔40
✔✔You are helping your friend design the plumbing system for a nursing home which
will "hold" 60 people. How many bathtub/showers must you design into the system? -
✔✔4
✔✔Floor drains shall have a minimum diameter of ___ inches - ✔✔2"
✔✔According to the WSSC PFGC, water piping in exterior walls shall be protected by a
minimum _______ insulation on the "cold" side of the piping and no insulation on the
warm side. - ✔✔R-24
✔✔A backflow technician license shall be valid for a period of ____ years. - ✔✔3
✔✔According to the IPC, the combined hot and cold water supply fixture unit value for a
half bath group is _____. - ✔✔2.9
✔✔A copper tee which is 1 inch straight-through with 1/2" as the side outlet is called a
_________ tee. - ✔✔1 x 1 x 1/2
✔✔Turning the screw clockwise (inwards) on a house pressure reducing valve will do
what? - ✔✔raise the water pressure
, ✔✔Which of the following is the best material to seal a faucet to a sink deck? -
✔✔100% pure silicone
✔✔Which of the following jobs does not require a WSSC permit? - ✔✔replace electric
water heater
✔✔A hole is dug 9' deep, 3 feet wide and 12 feet long. How many cubic yards is this? -
✔✔12
✔✔According to the IPC, the temperature of water from tankless water heaters shall be
a maximum of _______ *F when for domestic use. - ✔✔140
✔✔According to the WSSC PFGC., building sewers, other than those for private
sewage disposal systems, shall be ____ inches below grade - ✔✔24
✔✔According to the WSSC PFGC, the maximum depth from finished grade to the curb
valve on a water service shall be ___ inches. - ✔✔60
✔✔According to the WSSC PFGC, installation of a jumper on a water meter rack is
_____. - ✔✔prohibited
✔✔ Waste water discharged into the building drainage system shall not be over
_______ *F - ✔✔140
✔✔A water tank holds 50 gallons of water. How much does the 50 gallons of water
weigh? - ✔✔417 lbs
✔✔Exterior walls may be notched to a depth exceeding _______________ percent of
its width. - ✔✔25
✔✔According to the WSSC PFGC, a full flow building water service valve shall be
installed within _____ feet of where the water service enters the building. - ✔✔3'
✔✔According to the WSSC PFGC, water meters installed inside of buildings shall be
located in an area capable of maintaining _____ *F. - ✔✔50
✔✔In Prince George and Montgomery County, water service piping shall be not less
than _____ inches below grade. - ✔✔30
✔✔A cylindrical tank is 22 inches in diameter and 5 feet tall. How many gallons of water
will it hold? - ✔✔98
