3d
background
blue
bolt
button
chemical
conduit
connection
construction
control
element
engineering
equipment
factory
faucet
fuel
gas
gasoline
icon
illustration
industrial
isolated
isometric
metal
natural
ndustry
object
oil
orange
pipe
pipeline
piping
plumbing
power
pressure
pump
sign
square
steel
symbol
system
tap
technology
tube
valve
water
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