How does a drain work?

The drain system within your home works entirely by gravity, allowing wastewater to flow downhill through a series of large diameter pipes. All wastewater flows to the main waste and vent stack. The main stack curves to become a sewer line that exits the house near the foundation. In a municipal system this sewer line.Click to see full answer. Also question is, do toilet and shower use same drain?Toilets have the most direct route to the sewer, as well as the biggest drain line. When your sewer line is clogged, the water can’t go down the drain. Instead, it flows back up the pipes and comes out at the lowest point — usually the shower drain.Furthermore, how does waste leave the house? Drainage systems do not depend on pressure, as supply systems do. Instead, waste matter leaves your house because the drainage pipes all pitch, or angle, downward. Gravity pulls the waste along. The sewer line continues this downward flow to a sewage treatment facility or a septic tank. Also asked, what is the purpose of a drain trap? In most homes, there is a P-trap installed under the sinks in the bathroom and kitchens. A P-trap is a plumbing fixture that has several purposes. It traps debris that has drained from the sink and prevents it from forming a clog deep within the plumbing system, and to stops sewer gases from passing into the home.Does every drain need a trap?There are traps in every drain because any connection that leads to the drain system is also a possible outlet for sewer gas. Even your toilet has an internal trap shape to its porcelain configuration that serves exactly the same function.