bend
building
canalization
construction
crane
cross
detail
drain
element
engineering
equipment
faucet
fitting
fix
flow
fuel
gas
gasoline
group
icon
illustration
industrial
industry
isolated
metal
oil
pipe
pipeline
piping
plumbing
pressure
repair
set
sewer
sewerage
sign
steel
stream
symbol
system
tachometer
tap
technical
technology
tube
tubing
valve
water
welding