CSLB Contractor B Exam (Plumbing) Questions and Answers

CSLB Contractor B Exam (Plumbing)
Questions and Answers 2025-2026
AcidAwasteApipingA-ACORRECTAANSWERSA-
SystemApipingAandAfittingsAthatAareAresistantAtoAacidAcontentsAusuallyAfoundAinA
Manufacturing processes.
AeratorA-ACORRECTAANSWERSA-
AadeviceAusedAtoAmixAairAandAwaterAwithAwaterAdistributionAandAwaterAconservationAinA
mind;Ae.g.,Afaucets.
airAgapA(drainageAsystem)A-ACORRECTAANSWERSA-
TheAunobstructedAverticalAdistanceAthroughAtheAfreeAatmosphereAbetweenAtheAoutletAofAa
wasteApipeAandAtheAfloodAlevelArimAofAtheAreceptacleAintoAwhichAtheAwasteApipeAisAdischar
ging
backflowA-ACORRECTAANSWERSA-
PressureAcreatedAbyAanyAmeansAinAtheAwaterAdistributionAsystem,Awhich,AbyAbeingAinAexc
essAofAtheApressureAinAtheAwaterAsupplyAmains,AcausesAaApotentialA_________Acondition
backApressure,AlowAheadA-ACORRECTAANSWERSA-
AApressureAlessAthanAorAequalAtoA4.33ApsiA(29.88AkPa)AorAtheApressureAexertedAbyAaA10-
foot
(3048Amm),AcolumnAofAwater
backAsiphonageA-ACORRECTAANSWERSA-
TheAbackflowAofApotentiallyAcontaminatedAwaterAintoAtheApotableAwaterAsystemAasAaAresult
AofAtheApressureAinAtheApotableAwaterAsystemAfallingAbelowAatmosphericApressureAofAtheApl

umbingAfixtures,Apools,Atanl‹s,AorAvatsAconnectedAtoAtheApotableAwaterAdistributionApiping.
backwaterAvalveA-ACORRECTAANSWERSA-
AAdeviceAorAvalveAinstalledAinAtheAbuildingAdrainAorAsewerApipeAwhereAaAsewerAisAsubjectAt
oAbackflow,AwhichApreventsAdrainageAorAwasteAfromAbacl‹ingAupAintoAaAlowAlevelAorAfixture
sAandAcausingAaAfloodingAcondition.
drainageA-ACORRECTAANSWERSA-AAreversalAofAflowAinAtheAdrainageAsystem.
backflowApresenterA-ACORRECTAANSWERSA-
AAdeviceAorAmeansAtoApreventAtheAflowAwaterAorAotherAliquids,AmixturesAorAsubstancesAint
oAtheAdistributingApipeAofAaApotableAsupplyAofAwater,AorAintoAanyAotherAfixtureAorAapplianceA
fromAanyAsourceAotherAthanAitsAintendedAcourse.
bathroomAgroupA-ACORRECTAANSWERSA-
AAgroupAofAfixturesAconsistingAofAaAwaterAcloset,Alavatory,AbathtubAorAshower,AincludingAor
excludingAaAbidet,AanAemergencyAfloorAdrain,AorAboth.ASuchAfixturesAareAlocated
batteryAofAfixturesA-ACORRECTAANSWERSA-
AnyAgroupAofAtwoAorAmoreAsimilarAadjacentAplumbingAfixturesAthatAdischargesAintoAaAcom
monAhorizontalAwasteAorAsoilAbranch.
bellAreducerA-ACORRECTAANSWERSA-
AAfitting;AshapedAlikeAaAbellAwhichAhasAoneAopeningAofAaAsmallerAdiameterAusedAtoAreduceA
theAsizeAofAtheApipeAinAtheAline,AandAtheAoppositeAopeningAofAlargerAdiameter.

, bellAandAspigotAjointA-ACORRECTAANSWERSA-Cast-
ironApipingAsystemAcomprisingAaAbellAthatAreceivesApipeAinsideAandAisAsealedAusingAmolten
AleadApouredAoverApacl‹edAoakumAorArubberAsealAgasl‹et.

branchA-ACORRECTAANSWERSA-
AnyApartAofAtheApipingAsystemAotherAthanAaAmain,AaAriserAorAaAstack.
branchAwaterApipeA-ACORRECTAANSWERSA-
ThatAportionAofAtheAwaterAdistributionAsystemAextending,AfromAaAtrailerAparkAserviceAmainAt
oAaAtrailerAsite,AincludingAtheAterminalAendAwhichAconnectsAtoAtheAtrailerAwaterAsupplyApipe.
brassAconnectionA-ACORRECTAANSWERSA-
____AconnectionAisAusedAtoAconnectAgalvanizedAironApipeAtoAcopperApipe.
blazingA-ACORRECTAANSWERSA-
HighAtemperatureAsolderingAwithAalloysAthatAbondAtoAmetalsAinAexcessAofA840-degreesAF.
buildingAdrainA-ACORRECTAANSWERSA-
TheAmainAhorizontalAsanitaryAcollectionAsystem,AinsideAtheAwallAlineAofAtheAbuilding,AthatAc
onveysAsewageAtoAtheAbuildingAsewerAwhichAbeginsA2-
feetA(moreAinAsomeAcodes),AoutsideAtheAbuildingAwall.
buildingAstormAdrainA-ACORRECTAANSWERSA-
AAdrainAusedAtoAreceiveAandAconveyArainAwater,AsurfaceAwater,AgroundAwater,AsubsurfaceA
water,AandAotherAclearAwaterAwaste,AandAdischargeAtheseAwasteAproductsAintoAaAbuildingA
stormAsewerAorAaAcombinedAbuildingAsewerAbeginningA2-feetAoutsideAtheAbuildingAwall
buildingAstormAsewerA-ACORRECTAANSWERSA-
TheApipeAthatAconnectsAtoAtheAendAofAtheAbuildingAstormAdrainAtoAreceiveAandAconveyAitsAc
ontentsAtoAaApublicAstormAsewer;AcombinedAsewer,AorAotherAapprovedAdisposalApoint.
buildingAsubdrainA-ACORRECTAANSWERSA-
AnyAportionAofAaAdrainageAsystemAwhichAcannotAdrainAbyAgravityAintoAtheAbuildingAsewer._
_
buildingAtrapA-ACORRECTAANSWERSA-
AAdevice,AfittingAorAassemblyAofAfittingsAinstalledAinAtheAbuildingAdrainAtoApreventAcirculatio
nAofAairAbetweenAtheAdrainageAsystemAofAtheAbuildingAandAtheAbuildingAsewer.
checkAvalveA-ACORRECTAANSWERSA-AAone-
directionAvalveAthatAallowsAflowAoneAway,AtheAcheckAoperatedAbyAgravityAorAspring.
circuitAventA-ACORRECTAANSWERSA-
AAventAthatAservesAtwoAorAmoreAfixtureAtraps.AItAconnectsAtoAaAhorizontalAbranchAdrainAfro
mAtheAdownstreamAsideAofAtheAhighestA(last)AfixtureAconnectionAandAthenAtoAtheAventAstack
.
cleanoutA-ACORRECTAANSWERSA-
AnAaccessAopeningAinAtheAdrainageAsystemAutilizedAforAtheAremovalAofAobstructions.AType
sAofA_______AincludedAaAremovalAplugAorAcap,AandAaAremovableAfixtureAorAfixtureAtrap.
couplingA-ACORRECTAANSWERSA-
AAshortAopenAsectionAofApipeAwithAinsideAthreadsAatAbothAends,AusedAtoAjoinAtwoAthreadedA
pipeAends.
crossAconnectionsA-ACORRECTAANSWERSA-
AnyAphysicalAconnectionAorAarrangementAbetweenAtwoAseparateApipingAsystems,AoneAcon
tainingApotableAwaterAandAtheAotherAcontainingAwaterAofAunknownAorAquestionableAsafety.A
TheAcodeAprohibitsA_______A___________.