Plumbing abbreviations


Here some of the most common abbreviations used in the plumbing and heating trade.

ABS - acrylonitrile-butadiene-styrene
AL - aluminum
BG - bathroom group
BT - bath tub
CW - cold water or clothes washer
cm2 - square centimeter(s)
C - degrees Celsius
CI - cast iron
CO - clean out
CPVC - chlorinated polyvinyl chloride
dia - diameter
DF - drinking fountain
DW - dish washer
DWV - Drainage, waste and vent
FD - floor drain
FU - fixture unit
h, hrs - hour(s)
HW - hot water
HWT - hot water tank
in. - inches
ips - iron pipe size
kg/m2 - kilograms per meter squared
Kpa - kilopascals
Kn/m2 - kilonewtons per meter squared
KS - kitchen sink
L - litre(s)
L/s - litres per second
lav - lavatory
lbs - pounds
LT - laundry tray
m - meter(s)
m2 - meters squared
MJ - mechanical joint
mm - millimeters
PE - polyethylene
PEX - crosslinked polyethylene
PP-R - polyvinyl chloride
PRV - pressure relief valve or pressure reducing valve
Psi - pounds per squared inch
Psia - pounds per square inch absolute
Psig - pounds per square inch gauge
RD - roof drain
SH - shower
SJ - slip joint or soldered joint
SS - service sink
T&P - temperature and pressure relief
UR - urinal
WC - water closet (toilet)