CSLB Contractor B Exam (plumbing) with Complete Solutions.

acid waste piping - ANSWER-System piping and fittings that are resistant to acid contents usually found in manufacturing processes. aerator - ANSWER-A device used to mix air and water with water distribution and water conservation in mind; e.g., faucets. air gap (drainage system) - ANSWER-The unobstructed vertical distance through the free atmosphere between the outlet of a waste pipe and the flood level rim of the receptacle into which the waste pipe is discharging backflow - ANSWER-Pressure created by any means in the water distribution system, which, by being in excess of the pressure in the water supply mains, causes a potential _________ condition back pressure, low head - ANSWER-A pressure less than or equal to 4.33 psi (29.88 kPa) or the pressure exerted by a 10-foot (3048 mm), column of water back siphonage - ANSWER-The backflow of potentially contaminated water into the potable water system as a result of the pressure in the potable water system falling below atmospheric pressure of the plumbing fixtures, pools, tanl‹s, or vats connected to the potable water distribution piping. backwater valve - ANSWER-A device or valve installed in the building drain or sewer pipe where a sewer is subject to backflow, which prevents drainage or waste from bacl‹ing up into a low level or fixtures and causing a flooding condition