Master Massachusetts Plumbing Questions and Answers | Updated 2026

Master Massachusetts Plumbing Questions and Answers | Updated 2026 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 sealTransition 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