Master Plumbing: Massachusetts
Questions with Complete Solutions
2025-2026 Updated.
4 pounds - Answer Sheet lead for safe pan
3 pounds - Answer Lead roof flange
1/8" thick - Answer Brass toilet flange
1/4 " thick - Answer Cast iron flange
Are cast iron cleanout plugs allowed - Answer No
Rodding cleanout distance on 3" and bigger - Answer Clearance is 18"
Rodding cleanout distance on 2" or less - Answer Clearance is 12"
CPVC or Pex piping allowed for Hot Water Heaters or Boiler - Answer No closer than 24"
0% lead - Answer Lead free solder should contain 0%
3% lead fixture - Answer Max lead in a faucet fixture
Why use rector seal - Answer Lubricates and creates water tight seal
Transition from abs - Answer PVC to ABS connections to be made via male to female adapter
24" - Answer Fixture outlet to trap weir not to exceed 24"
Combination Fixtures - Answer Max 30" apart and no more than 6in deeper than another
Prohibited traps - Answer Bell, crown vented, full "s" traps- *Drum Traps are allowed!
, Min trap seal - Answer Min trap seal is 2-4 "
Deadend Pipe - Answer 2' or greater
10" underground pipe or larger - Answer Manhole @ change of size, alignment, grade or
elevation
Grease trap - Answer 2 pounds per gpm
Commercial Laundry - Answer Commercial Laundry drain must handle 75% of total washing
machines
Shower Stall - Answer 900 Sq in or 30 measured as the side of a rectangle (interior
dimensions).
Shower Pans - Answer Shower Pans must be turned up on all sides at least above the
threashold
Shower temperature - Answer Shower head not exceed 110 or 112
Trapping commercial food grinder - Answer Commercial food waste grinder trapped
separately
Washing Machine standpipe - Answer Washing machine stand pipe min is 30" above the
base of machine and 18-30" above trap and discharge through an air break
Sacrium - Answer Sacrium drains in a dry well
1 DFU - Answer Equals 7.5 GPM
Back water valve - Answer Back water valve on outlet pipe on ejector
Minimum GPM on Residential Ejector Pump - Answer Residential Ejector Pump minimum is
20 GPM
Sanitary Tee - Answer No longer called an Esterbrook
Questions with Complete Solutions
2025-2026 Updated.
4 pounds - Answer Sheet lead for safe pan
3 pounds - Answer Lead roof flange
1/8" thick - Answer Brass toilet flange
1/4 " thick - Answer Cast iron flange
Are cast iron cleanout plugs allowed - Answer No
Rodding cleanout distance on 3" and bigger - Answer Clearance is 18"
Rodding cleanout distance on 2" or less - Answer Clearance is 12"
CPVC or Pex piping allowed for Hot Water Heaters or Boiler - Answer No closer than 24"
0% lead - Answer Lead free solder should contain 0%
3% lead fixture - Answer Max lead in a faucet fixture
Why use rector seal - Answer Lubricates and creates water tight seal
Transition from abs - Answer PVC to ABS connections to be made via male to female adapter
24" - Answer Fixture outlet to trap weir not to exceed 24"
Combination Fixtures - Answer Max 30" apart and no more than 6in deeper than another
Prohibited traps - Answer Bell, crown vented, full "s" traps- *Drum Traps are allowed!
, Min trap seal - Answer Min trap seal is 2-4 "
Deadend Pipe - Answer 2' or greater
10" underground pipe or larger - Answer Manhole @ change of size, alignment, grade or
elevation
Grease trap - Answer 2 pounds per gpm
Commercial Laundry - Answer Commercial Laundry drain must handle 75% of total washing
machines
Shower Stall - Answer 900 Sq in or 30 measured as the side of a rectangle (interior
dimensions).
Shower Pans - Answer Shower Pans must be turned up on all sides at least above the
threashold
Shower temperature - Answer Shower head not exceed 110 or 112
Trapping commercial food grinder - Answer Commercial food waste grinder trapped
separately
Washing Machine standpipe - Answer Washing machine stand pipe min is 30" above the
base of machine and 18-30" above trap and discharge through an air break
Sacrium - Answer Sacrium drains in a dry well
1 DFU - Answer Equals 7.5 GPM
Back water valve - Answer Back water valve on outlet pipe on ejector
Minimum GPM on Residential Ejector Pump - Answer Residential Ejector Pump minimum is
20 GPM
Sanitary Tee - Answer No longer called an Esterbrook
