MASTER PLUMBING WSSC 2026
COMPREHENSIVE STUDY GUIDE
QUESTIONS AND ANSWERS COMPLETE
PRACTICE REVIEW GRADED A+
⩥ Solder must be lead free
Answer: (0.2 percent or less) all solder must be lead free
⩥ Joints in PVC are made with
Answer: Solvent Cement and Purple Primer
⩥ Water Supply Shutoff Valve
Answer: must be installed on the supply to each fixture
⩥ Cross Connections
Answer: Must have air gaps or protective devices installed.
⩥ In unstable ground, building drains and sewers
Answer: Must be of ABS, PVC, Cast-Iron, or Copper.
⩥ Minimum 1/4 inch per fall on
,Answer: all 2 1/2 inches or smaller pipe.
⩥ A 4 by 3 inch water closet connection is
Answer: acceptable and not considered a reduction or obstruction.
⩥ Hub and Spigot joints in Cast-Iron are
Answer: made with oakum or hemp and lead. (caulked joint)
⩥ Cast iron to plastic pipe joints shall
Answer: shall be made by caulked or mechanical compression joints.
⩥ Drilled, tapped, or saddle type joints
Answer: are prohibited.
⩥ Cleanout plugs shall be made of
Answer: shall be made of brass or plastic.
⩥ A clearance no less than ------ must be provided for rodding on 6 inch
cleanout and smaller.
Answer: 18 inches
⩥ Water closets must use a maximum of
, Answer: 1.6/gallons a flush
⩥ Change of direction from vertical to horizontal must be made by
Answer: a long turn fitting.
⩥ The minimum slope of pipe smaller than 3 inches is --- per foot for
building drains and sewers. Large pipe may have ---- per foot slope.
Answer: 1/4 inch and 1/8 inch.
⩥ All food storage and handling equipment shall discharge through an
indirect waste by
Answer: an air gap.
⩥ Chemical systems must be drained and vented
Answer: separate from the sanitary systems.
⩥ Trap seals shall be protected from back pressure and from siphonage
by
Answer: vents and pressure the same as outside air
⩥ flashing shall be used to seal the vent ----
Answer: water tight where it passes through the roof
COMPREHENSIVE STUDY GUIDE
QUESTIONS AND ANSWERS COMPLETE
PRACTICE REVIEW GRADED A+
⩥ Solder must be lead free
Answer: (0.2 percent or less) all solder must be lead free
⩥ Joints in PVC are made with
Answer: Solvent Cement and Purple Primer
⩥ Water Supply Shutoff Valve
Answer: must be installed on the supply to each fixture
⩥ Cross Connections
Answer: Must have air gaps or protective devices installed.
⩥ In unstable ground, building drains and sewers
Answer: Must be of ABS, PVC, Cast-Iron, or Copper.
⩥ Minimum 1/4 inch per fall on
,Answer: all 2 1/2 inches or smaller pipe.
⩥ A 4 by 3 inch water closet connection is
Answer: acceptable and not considered a reduction or obstruction.
⩥ Hub and Spigot joints in Cast-Iron are
Answer: made with oakum or hemp and lead. (caulked joint)
⩥ Cast iron to plastic pipe joints shall
Answer: shall be made by caulked or mechanical compression joints.
⩥ Drilled, tapped, or saddle type joints
Answer: are prohibited.
⩥ Cleanout plugs shall be made of
Answer: shall be made of brass or plastic.
⩥ A clearance no less than ------ must be provided for rodding on 6 inch
cleanout and smaller.
Answer: 18 inches
⩥ Water closets must use a maximum of
, Answer: 1.6/gallons a flush
⩥ Change of direction from vertical to horizontal must be made by
Answer: a long turn fitting.
⩥ The minimum slope of pipe smaller than 3 inches is --- per foot for
building drains and sewers. Large pipe may have ---- per foot slope.
Answer: 1/4 inch and 1/8 inch.
⩥ All food storage and handling equipment shall discharge through an
indirect waste by
Answer: an air gap.
⩥ Chemical systems must be drained and vented
Answer: separate from the sanitary systems.
⩥ Trap seals shall be protected from back pressure and from siphonage
by
Answer: vents and pressure the same as outside air
⩥ flashing shall be used to seal the vent ----
Answer: water tight where it passes through the roof
