SECTION 8 - PLUMBING SYSTEM CLASS C MOTOR HOME
GH/M 8 - 14
Potential damage to suspension components, such as springs, tires and axles,
could result. If your motor home holding tank(s) are located behind the axles, the
weight of the full tank(s) will reduce the hitch weight. Motor home sway and other
handling difficulties can be the result of the hitch weight being too light.
Dump the gray and black water holding tanks before traveling to avoid carrying
unnecessary weight. If you are dry camping and cannot immediately empty your
holding tanks, reduce your vehicle speed until you reach a dumping station. When
connected to the sewer drain line at a campground, keep the “black tank drain”
valve closed until the holding tank is at least ¾ full. This should provide sufficient
water to assist in complete draining of the black water holding tank. Repeat as
needed.
Before using the motor home or after dumping the grey and black water holding
tanks, always add the proper amount of deodorant to the black water tank to
prevent malodors and help break down holding tank contents (unless winterizing).
Follow the deodorant bottle or package instructions. Driving to a disposal site will
normally loosen any accumulated waste debris or solids from the sides of the
holding tanks.
Never leave the black tank drain in the open position continuously when
connected to the campground sewer system.
BLACK & GREY TANK DRAINS
The grey tank drain and black tank drain are also referred to as dump valves.
Always drain the black water holding tank first so the following grey tank waste
water can help rinse any solids or debris from the dump outlet and sewer hose.
1. To make drainage easier, level the motor home.
2. Remove the sewer hose housing dust cap, and attach the sewer hose.
3. Place the end of the sewer hose into the approved dump station.
4. Open the black tank dump valve (close it when the black water holding tank is
emptied).
5. Open the grey tank dump valve (close it when the grey holding tank is
emptied).
6. Remove, clean and store the sewer hose.
7. Close the sewer hose housing dust cap.
You can locate many dump stations throughout the United States and Canada in
Woodall’s, Rand McNally Camp Guide, Good Sam Camp Guide, KOA
Kampgrounds Camp Guide and various other publications. Some fuel stations
also have dump stations.
Please contact your RV dealer for assistance in the purchase and installation of a
sewer hose and/or sewer hose extension (if needed).
WARNING
Do not add automotive antifreeze or caustic chemicals such as laundry
detergents into the holding tanks. Although these products may have a
deodorizing effect, they may damage the plastic and rubber parts of the
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