![]() ![]() The water that comes into your home is under pressure. One subsystem brings freshwater in, and the other takes wastewater out. The plumbing system in your home is composed of two separate subsystems. You can save yourself time, trouble and money! Knowing this, you can understand its "mysteries" and make dozens of fixes to your home's plumbing system. Plumbing follows the basic laws of nature - gravity, pressure and water seeking its own level. At the fixtures (bridges between the two systems), the air admitted by the vent stack and vent pipes keeps the traps sealed and prevents sewer gases from backing up through the drains. Your home's supply and drainage system must always be two distinct subsystems, with no overlapping.
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