Every time you run water it flushes the trap but gravity does its magic to keep some water in the lowest part of the traps. The water seal forces the sewer smells to exit out of the roof vent instead of the fixture. Traps use water to close, or seal, the drainage-waste pipe so sewer smells in mobile homes don’t occur. There used to be S-traps but those aren’t used anymore. There are two main kinds of traps used in a mobile home: P-traps and running traps. Traps are a part of your ventilation system and they are called a trap because it actually traps water. P – TrapsĪ trap is a curved pipe under your fixtures but you usually only see the traps under your sink. It’s cheaper because it uses less pipe and quicker because you don’t have to anything but screw an auto vent. ![]() ![]() We’ll cover them more below.Ī lot of plumbers will use auto vents instead of running a wet vent or a direct vent in new home construction and remodels. Auto-vents do not let the air out, only in. Auto Vents or Air Admittance ValvesĪn auto-vent is a small device that is usually placed under sinks to let air into the drain waste line so it can keep the right vacuum or pressure when draining. It could also be the kitchen sink and the laundry sink, whichever is closest. Wet vents can consist of a toilet and sink or a toilet, sink, and tub (right image below). Plumbing codes vary with these and there are a lot of restrictions. When one pipe serves as both drain pipe and vent pipe it’s called a wet vent. These vents tend to get clogged with leaves, bird or bee nests, or any other debris that can find its way into a pipe sticking out of a roof. The most common kind of vent is called a direct vent also referred to as a vent stack, soil stack, or VTR which is short for ‘vent through the roof.’ You can see these vents coming out of the roof or running up the side of the home where the drain line meets the sewer line (if needed). Mobile and manufactured homes typically use 2 kinds of vents in their ventilation system: the direct vent, and the auto vent. And they all mean the same thing.Įlements of a Mobile Home Ventilation System Vent lines or drain-waste-vents (or DWV) are also used. The ventilation system is called several different things: ventilation pipes or ventilation lines, or just vents for short. Without the ability to breath, draining water would create a vacuum or suction that pulls all the water out of the P-traps (at all fixtures and before sewer line connections). The ventilation system allows air to enter your drain lines so it can keep the right atmospheric pressure in the pipe. act as a planned route for sewer smells to follow so no one smells the foul odors in the drain waste pipe.Ī healthy plumbing system must be able to breathe and it does that via the vents.maintain pressure in the drain lines and help wastewater to drain smoothly.I’ve seen some articles claim mobile homes didn’t have vents but it’s just another mobile home myth.Ī ventilation system is part of the drain-waste system but it’s still considered to be a separate system. Yes, all mobile homes have ventilation systems. The pipes are installed at a slope so gravity can push the waste away. It needs the help of gravity and vent lines to keep the correct pressure in the pipe and push sewer smells up and away from the home.ĭrain lines are the big (usually white) pipes under a mobile home that go from the water fixtures to the sewer or septic. Drain lines also need healthy pipe and tight fittings that can carry wastewater to the sewer lines or septic tank. Our article about heat tape will help keep your supply lines from freezing.Ī Drain-Waste System flushes away the used wastewater. Frozen water lines is another big problem that manufactured homeowners face. Leaks around connections is a common concern with supply lines. Leaks, pressure, and the water heater cause the most common issues for supply lines. For the hot water, supply lines go through a water heater first. The more you open the faucet the more water you get. You turn the handle on a sink and the pressure forces the water out. The supply lines, or water lines, need healthy pipes with tight connections (called fittings) that must handle high-pressure water. Supply lines carry water into and throughout your home. All three of these systems work together so a homeowner must understand all three before they can attempt to diagnose any issue. The 3 Parts of a Mobile Home Plumbing SystemĮvery home plumbing system is made up of 3 elements, or systems.
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