Venting Mobile Home Drain Lines
Venting is one of the areas where mobile homes differ from site built
homes. In site built homes every drain has a vent pipe that eventually goes up
through the roof. The purpose is to prevent the siphon effect of water going
down the drain from pulling all the water out of the trap. In mobile homes venting
is frequently accomplished with one way air valves that will be located under the sink.
If the valve fails you may smell sewer gas inside the home because it is no longer
blocked by water in the trap. The valve may be threaded and easily unscrewed for
replacement or glued on and you will have to cut the line to replace the valve.
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