機器
anticorrosion
appliance
background
basement
blue
boiler
brass
building
construction
copper
energy
gas
heat
heating
home
hot
house
improvement
industrial
industry
maintenance
metal
pipe
pipeline
plant
plastic
plumber
plumbing
power
pressure
pump
red
renovation
repair
repairman
service
site
steel
technical
technology
treatment
tube
utility
valve
water
work
worker
wrench