PLUMBER’S EXAM | INTERIOR DESIGN PROFESSIONAL EXAM
2026/2027 LATEST UPDATE | QUESTIONS AND VERIFIED ANSWERS
| GRADED A+
Sewage Ejector -
CORRECT|ANSWER
Type of pump that discharges waste in the sump pit and transfers the waste to the house drain.
(Max Fajardo)
503 mm -
CORRECT|ANSWER
Minimum dimension of a septic tank manhole.
Industrial drain -
CORRECT|ANSWER
drain that discharges objectionable waste such as acids and other chemicals from industrial
equipment .
75 mm -
CORRECT|ANSWER
Minimum diameter of pipe of any water closet.
3-
CORRECT|ANSWER
Maximum number of water closets able to discharge into a shared 75mm diameter horizontal soil
branch
Combination Sewer -
CORRECT|ANSWER
Type of sewer that discharges both storm water and sewage from households, rendered obsolete
due to the health hazards it poses
Septic Tank -
,CORRECT|ANSWER
Airtight receptacle used to expedite the decomposition of elements contained in raw sewage,
usually located 1.5 meters from the property line and 15.2 meters from the water main or any
potable water source. It is comprised of two chambers that contain anaerobic bacteria that break
down wastes.
Sedimentation -
CORRECT|ANSWER
Term defined as the settling down or separation of solid matter suspended in a liquid.
1% -
CORRECT|ANSWER
Minimum slope or grade (in %) permitted with 100mm (4'') pipes.
Scum -
CORRECT|ANSWER
Lighter organic solid particles found in sewage, cesspools and septic tanks, found floating on the
liquid.
Sludge -
CORRECT|ANSWER
Term defined as the organic particles that have settled down in septic tanks, cesspools or sewage.
900 mm -
CORRECT|ANSWER
Minimum WIDTH of a septic tank for residential dwellings. (mm)
1500 mm -
CORRECT|ANSWER
Minimum LENGTH of a septic tank for residential dwellings. (mm)
1200 mm -
CORRECT|ANSWER
,Minimum DEPTH of a septic tank for residential dwellings. (mm)
Hair -
CORRECT|ANSWER
Leading cause of pipe clogs in waste and soil pipes.
Drainage, Waste and Vent -
CORRECT|ANSWER
Definition of DWV
Acrylonitrile butadiene styrene -
CORRECT|ANSWER
Definition of ABS
Oval -
CORRECT|ANSWER
Cross sectional shape of the interior of Polybutene pipes (PB).
38 mm -
CORRECT|ANSWER
Minimum size of cleanouts. (mm)
Corporation Stop -
CORRECT|ANSWER
Type of valve found in the service main, used as a control of the water service and shut off valve
when service is disconnected.
Check Valve -
CORRECT|ANSWER
Type of valve used to prevent backflow or reversal of flow of water, usually found after the water
meter.
, Union Patente -
CORRECT|ANSWER
Fitting used to describe the connection of the service pipe and water meter. Usually used as the
demarcation between the property of the water service and water supply pipe system residential
dwelling or building.
Booster Pump / Pneumatic Pump -
CORRECT|ANSWER
Type of pump used to distribute water within a building or residence, when an upfeed system
cannot provide adequate pressure to supply fixtures with potable water.
Durham System -
CORRECT|ANSWER
Type of piping system that is characterized by threading and connecting cast iron pipes in the
building.
Teflon Tape -
CORRECT|ANSWER
Material used to fuse joints or connections of GI pipes.
Caulking -
CORRECT|ANSWER
Process of joining the joints and connections of cast iron pipes.
Motor Oil -
CORRECT|ANSWER
Type of oil used when threading GI pipes.
Centrifugal Pump -
CORRECT|ANSWER
Type of pump used for high-rise or mid-rise buildings, when booster or piston pumps are unavailable
or inadequate.
2026/2027 LATEST UPDATE | QUESTIONS AND VERIFIED ANSWERS
| GRADED A+
Sewage Ejector -
CORRECT|ANSWER
Type of pump that discharges waste in the sump pit and transfers the waste to the house drain.
(Max Fajardo)
503 mm -
CORRECT|ANSWER
Minimum dimension of a septic tank manhole.
Industrial drain -
CORRECT|ANSWER
drain that discharges objectionable waste such as acids and other chemicals from industrial
equipment .
75 mm -
CORRECT|ANSWER
Minimum diameter of pipe of any water closet.
3-
CORRECT|ANSWER
Maximum number of water closets able to discharge into a shared 75mm diameter horizontal soil
branch
Combination Sewer -
CORRECT|ANSWER
Type of sewer that discharges both storm water and sewage from households, rendered obsolete
due to the health hazards it poses
Septic Tank -
,CORRECT|ANSWER
Airtight receptacle used to expedite the decomposition of elements contained in raw sewage,
usually located 1.5 meters from the property line and 15.2 meters from the water main or any
potable water source. It is comprised of two chambers that contain anaerobic bacteria that break
down wastes.
Sedimentation -
CORRECT|ANSWER
Term defined as the settling down or separation of solid matter suspended in a liquid.
1% -
CORRECT|ANSWER
Minimum slope or grade (in %) permitted with 100mm (4'') pipes.
Scum -
CORRECT|ANSWER
Lighter organic solid particles found in sewage, cesspools and septic tanks, found floating on the
liquid.
Sludge -
CORRECT|ANSWER
Term defined as the organic particles that have settled down in septic tanks, cesspools or sewage.
900 mm -
CORRECT|ANSWER
Minimum WIDTH of a septic tank for residential dwellings. (mm)
1500 mm -
CORRECT|ANSWER
Minimum LENGTH of a septic tank for residential dwellings. (mm)
1200 mm -
CORRECT|ANSWER
,Minimum DEPTH of a septic tank for residential dwellings. (mm)
Hair -
CORRECT|ANSWER
Leading cause of pipe clogs in waste and soil pipes.
Drainage, Waste and Vent -
CORRECT|ANSWER
Definition of DWV
Acrylonitrile butadiene styrene -
CORRECT|ANSWER
Definition of ABS
Oval -
CORRECT|ANSWER
Cross sectional shape of the interior of Polybutene pipes (PB).
38 mm -
CORRECT|ANSWER
Minimum size of cleanouts. (mm)
Corporation Stop -
CORRECT|ANSWER
Type of valve found in the service main, used as a control of the water service and shut off valve
when service is disconnected.
Check Valve -
CORRECT|ANSWER
Type of valve used to prevent backflow or reversal of flow of water, usually found after the water
meter.
, Union Patente -
CORRECT|ANSWER
Fitting used to describe the connection of the service pipe and water meter. Usually used as the
demarcation between the property of the water service and water supply pipe system residential
dwelling or building.
Booster Pump / Pneumatic Pump -
CORRECT|ANSWER
Type of pump used to distribute water within a building or residence, when an upfeed system
cannot provide adequate pressure to supply fixtures with potable water.
Durham System -
CORRECT|ANSWER
Type of piping system that is characterized by threading and connecting cast iron pipes in the
building.
Teflon Tape -
CORRECT|ANSWER
Material used to fuse joints or connections of GI pipes.
Caulking -
CORRECT|ANSWER
Process of joining the joints and connections of cast iron pipes.
Motor Oil -
CORRECT|ANSWER
Type of oil used when threading GI pipes.
Centrifugal Pump -
CORRECT|ANSWER
Type of pump used for high-rise or mid-rise buildings, when booster or piston pumps are unavailable
or inadequate.
