COSC 325 HOUSTON (PLUMBING) EXAM QUESTIONS AND ANSWERS 100% PASS 2026/2027

COSC 325 HOUSTON (PLUMBING) EXAM
QUESTIONS AND ANSWERS 100% PASS
2026/2027




SS - ANS Sanitary Sewer



ABS - ANS Black plastic material



VTR - ANS vent through roof



Primary Purpose of roof vent - ANS Let air into system



What division is plumbing - ANS 22



Invert Depth - ANS elevation of the bottom inside of the pipe



DW - ANS Domestic Water



CPVC (chlorinated polyvinyl chloride) - ANS hot and cold water supply, off white color




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, FDC - ANS Fire Department Connection



Above ground pipe material - ANS Metal



1 CFH (Cubic Feet per Hour) - ANS 1000Btu/h



OSHA requirement for fall protection - ANS 6 feet



OSHA requirement for trenching - ANS 5 feet



Wall thickness terms for copper - ANS Type L, K, M



DWV - ANS abbreviation for drainage, waste, and vent. Found on "p" sheets



What are the four groups of plumbing pipe and fitting material? - ANS Plastic, Copper, Cast
Iron, Steel



What is Expansion loop for? - ANS In plastic, provides an area for tubing to expand



What plastic pipe is common for DWV? - ANS Schedule 40 ABS



What is the max length of rigid plastic DWV pipe? - ANS 35'



What is ABS typically used for? - ANS Sanitary drainage, vent, aboveground and underground
storm water drainage.



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