background
bend
bile
bolt
carbon
connector
construction
control
design
element
engineering
equipment
faucet
fitting
flange
flat
fuel
gas
gasoline
gauge
handle
icon
illustration
industrial
industry
isolated
joint
line
metal
oil
outline
pipe
pipeline
plumbing
pressure
refinery
set
sewage
sewer
sign
stainless
steel
symbol
tap
technology
tube
valve
water
wireframe