Sewer backflow preventers are an essential part of your home's plumbing. Here's why you need one and how to test if yours is ...

Find his work on sites like Angi, USA Today and The Pen... Backflow preventer installation costs between $105 and $1,400, with the average property owner spending $325 per backflow preventer.

A big pipe carries waste from your house to the main sewer line under the street. If either becomes plugged or overloaded, ...