E-How is useless for information on Plumbing...
They are a content farm that produces useless articles on everything and relies on advertising clicks to make money....
Unfortunately they come up in searches and often above sites that have much better and more credible information.
Google hasn't figured out a way to knock them down and bring the results of better sites up yet....
Their efforts to do so have cut the traffic from better sites as well...
Here is the Bio of the E-How Article Author....
Elizabeth Grace
Based in Grand Rapids, Michigan, Elizabeth Grace is a freelance writer. She holds a Bachelor of Arts in public relations from Pepperdine University, and has 15 years of experience developing marketing campaigns for universities and multinational corporations.
Notice the plumbing credentials?