bypass
closing
concept
conduit
connection
construction
consumption
control
crane
distribution
drain
energy
engineering
equipment
faucet
flue
fuel
gas
gasoline
gate
hydrant
industrial
industry
isolated
metal
object
oil
outlet
petrol
pipe
pipeline
piping
plumb
plumbing
pump
resource
sanitary
shutoff
stop
stopcock
system
tap
transit
transmission
tube
tubing
valve
waste
water