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Black/Grey Water System and Tanks
Water from the sinks and shower ows into the gray water (or waste water) holding tank.
Water from the toilet will ow into the sewage (or black water) holding tank (see Black/Grey
Water Holding Tanks).
The drain pipes may be equipped with a “P-trap” installed to help prevent odors from escap-
ing into the RV. During travel, water from the P-traps may spill and permit odors into the RV.
By adding water and using a RV approved deodorizing agent you will dissolve the contents
faster and will keep the drain lines and tanks clean and free owing. These chemicals are
available at an RV supply store or your dealer.
Your RV may be equipped with a dry sealing valve that
prevents the escape of odors from your waste system
and eliminates the need for P-traps. Should the RV
drain piping system become clogged and a mechanical
cleanout tool is used to open the drain pipe, it is impor-
tant that the dry valve be removed before passing the
cleanout tool through the piping. Passing a mechanical
cleanout tool through the waterless valve may cause
damage to the internal seal that may potentially allow
sewer gases to escape into the RV interior. The water-
less trap can be unscrewed from the water lines. A la-
bel has been placed near the location of the waste valve that reads as follows:
Depending on your RV model, the sewer drain hose may be stored in an exterior compart-
ment marked “Sewer Hose” or it may be located in the hollow square tube bumper. The
bumper has removable plastic end caps, and the hose slides inside the hollow bumper.
Another important part of this system is the vent
pipes and vents that release air from the grey and
black water holding tanks. On most models the
exterior vent cap is attached to the roof and must
be kept clear of obstructions to perform as intend-
ed. On some models, the vent pipe may be part
of the drainage system referred to as a “wet vent”
(water ows downward as air ows upward in the
same pipe).
Some models are equipped with a side vent system. On these models this label will be next
to the termination valve.This label should not be removed from your recreation vehicle.
Dump the gray and black water holding tanks before traveling to avoid carrying unnecessary
weight. The weight of the holding tank contents is not calculated into the RV cargo carrying
capacity (this extra weight would reduce your available cargo capacity). Traveling with full
holding tank(s) could possibly cause you to exceed the individual tire ratings and/or the RV
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