WPiping
WAirlift pump
WAN thread
WBarlow's formula
WCement-mortar lined ductile iron pipe
WCloset flange
WConcentric reducer
WCoupling (piping)
WCured-in-place pipe
WDrill pipe
WDuctile iron pipe
WElectrofusion
WExpansion joint
WFire sprinkler system
WPipefitter
WFlange
WFluid dynamics
WFriction loss
WGlobe valve
WGooseneck (piping)
WHydrogen pipeline transport
WHydrostatic test
WInsulated pipe
WJIC fitting
WMetal expansion joint
WMoody chart
WNational pipe thread
WNipple (plumbing)
WPipe (fluid conveyance)
WPipe wrench
WPipeline transport
WPiping and plumbing fitting
WPlastic pipework
WPlug (sanitation)
WRelief valve
WReynolds number
WRiser clamp
WRupture disc
WSleeve (construction)
WSprinkler fitting
WStandpipe (firefighting)
WStatic mixer
WThread protector
WThreaded pipe
WTrace heating
WTrap (plumbing)
WTube (fluid conveyance)
WTube bending
WTubular pinch effect
WValve