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Vents
A very important part of your sanitation system is the vent system in
your coach. These vents release air from holding tanks allowing
water to enter. Vent pipes are attached to the holding tank, fed
through the cabinet walls and to the roof. On some models a
portion of vent pipe may be part of the drainage system referred to
as a “wet vent”. As air flows upward, water will be draining
downward in the same pipe.
Outlet for most vents is the “mushroom” cap located on the roof of
your coach.
Holding Tanks
The final parts of your sanitation system are the holding tanks for
waste materials and water. These are located below the floor of
your coach.
Gray Tank. Waste water from the bath tub, shower and sinks will
drain into this container. No special preparation is required,
however, you may wish to add baking soda or a Thetford chemical
to reduce odors from food particles in the system.
All drain pipes will have a “P-trap” installed into each line. Water in
these traps prevent odors from escaping into the coach. During
travel, water from the P-traps may spill and permit odors into the
coach. These odors come from fats and food particles decomposing
in the tank. By adding water and using a RV approved deodorizing
agent, contents will dissolve faster, keeping the drain lines and tanks
clean and free flowing. These chemicals are available at a RV
supply store.
Waste Tank. The toilet drains into the waste or “black” holding tank.
For correct preparation follow the listed steps:
1. Release two quarts of water into the toilet bowl.
2. Place the recommended quantity of chemicals for waste holding
tank as per instructions on the bottle into the toilet bowl.
3. Flush liquids into the tank and allow up to two gallons of water to
flow into the tank.
Each time you drain the tank, you should follow the above
instructions before using.
Draining the Tanks
A final part of your sanitation system is the drainage of holding
tanks. Realizing dump stations will vary, place the coach as level as
possible to make drainage easier. Some tanks drain from the center
requiring level or slightly up in front. Others will drain from end
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