noun
plumbing industry
Refers to the trade or industrial sector dealing with piping, plumbing, and related installation and maintenance work.
彼は配管工業で長年働いている。
He has worked in the plumbing industry for many years.
配管 refers to piping or plumbing work itself, while 配管工業 specifically denotes the industry or trade.
Compound of 配管 (plumbing, piping) and 工業 (industry).