Master Plumber Exam 1 Questions With 100% Correct Answers | Updated 2026 | Graded A+

Master Plumber Exam 1 Questions With 100% Correct Answers | Updated 2026 | Graded A+ Sewage Ejector - answer-Type of pump that discharges waste in the sump pit and transfers the waste to the house drain. (Max Fajardo) 503 mm - answer-Minimum dimension of a septic tank manhole. Industrial drain - answer-drain that discharges objectionable waste such as acids and other chemicals from industrial equipment. 75 mm - answer-Minimum diameter of pipe of any water closet. 3 - answer-Maximum number of water closets able to discharge into a shared 75mm diameter horizontal soil branch Combination Sewer - answer-Type of sewer that discharges both storm water and sewage from households, rendered obsolete due to the health hazards it poses Septic Tank - 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 - answer-Term defined as the settling down or separation of solid matter suspended in a liquid. 1% - answer-Minimum slope or grade (in %) permitted with 100mm (4'') pipes.Scum - answer-Lighter organic solid particles found in sewage, cesspools and septic tanks, found floating on the liquid. Sludge - answer-Term defined as the organic particles that have settled down in septic tanks, cesspools or sewage. 900 mm - answer-Minimum WIDTH of a septic tank for residential dwellings. (mm) 1500 mm - answer-Minimum LENGTH of a septic tank for residential dwellings. (mm) 1200 mm - answer-Minimum DEPTH of a septic tank for residential dwellings. (mm) Hair - answer-Leading cause of pipe clogs in waste and soil pipes. Drainage, Waste and Vent - answer-Definition of DWV Acrylonitrile butadiene styrene - answer-Definition of ABS Oval - answer-Cross sectional shape of the interior of Polybutene pipes (PB). 38 mm - answer-Minimum size of cleanouts. (mm) Corporation Stop - 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 - answer-Type of valve used to prevent backflow or reversal of flow of water, usually found after the water meter. Union Patente - 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 - 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 - answer-Type of piping system that is characterized by threading and connecting cast iron pipes in the building. Teflon Tape - answer-Material used to fuse joints or connections of GI pipes. Caulking - answer-Process of joining the joints and connections of cast iron pipes. Motor Oil - answer-Type of oil used when threading GI pipes. Centrifugal Pump - answer-Type of pump used for high-rise or mid-rise buildings, when booster or piston pumps are unavailable or inadequate. Piston Pump - answer-Type of pump used for residential or low-rise buildings, and comes in single action, double action or twin.