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TIFFIN MOTORHOMES
–ALLEGRO®
Chapter 11
PLUMBING & BATH FIXTURES
The blade that closed the opening in the sewer drainpipes is connected to the T-handle to release contents of the
tank(s) when pulled. The sewer line must be securely capped during self-containment use to prevent leakage of waste
materials onto the ground or pavement. Do not pull the holding-tank gate valve "open" when the protective cap is
installed on the pipe. Always drain the tank into an acceptable sewer inlet or dump station.
Whenever possible, drain both the holding tanks prior to traveling. The carrying capacity of your vehicle will be reduced
if water is left in the black or gray tanks.
The holding tanks should only be drained when they are at least 3/4 full. Doing this will provide a sufficient volume of
water to allow the complete flushing of waste materials in the drain lines and hose. If the tanks are not 3/4 full, add
enough water to allow for sufficient flushing.
To empty the wastewater tanks, connect the adapter, supplied with your
vehicle, to the drain hose (Figure 11-10). If the adapter is lost or broken,
another one can readily be purchased from any RV supply store. Once you
have placed the adapter on the drain hose, it can remain there for the life of
the hose. One end of the hose threads up through the hole in the bottom of
the service compartment and the other end of the hose feeds into the sewer
at the dump station.
Unscrew the cap from the drain. Connect the hose, with the adapter in place,
to the drain fitting. Open the gate valve completely by pulling on the T-
handle. The tank will start to drain as soon as the T-handle is pulled. After
you have drained the black-water tank, immediately drain the gray-water
tank. This procedure helps to flush the black water from the sewage hose.
Figure 11-10. Wastewater Drain Hose and
Connection in Sanitation Compartment
When both of the tanks are empty, flush them with a freshwater rinse before
you close the valves. The gray tanks are easily flushed by pouring a couple of gallons of water into a sink drain. The
drain outlet is engineered for quick release of the drain hose adapter. Always close the gate valves and secure the end
cap to prevent leakage while the vehicle is in transit.
After draining the black-water tank, it is recommended to add a holding-tank deodorant to help control the odor and
break down the solids. Follow the instructions given on the holding-tank deodorant package.
When using dump stations for draining the holding tanks, keep other travelers in mind. Please practice good
housekeeping! Leave the dump stations in good order. Above all, do not pollute!
Sewer Connection and Camping
When camping at parks with sewer connections, it is important to keep the black-water, holding-tank, gate valve closed
at all times, except when dumping. The gray tank can be kept open while hooked to a sewer connection, but again, the
black-water tank must be kept closed. This is done so that an ample quantity of liquid remains in the tank to provide a
smooth flow through the gate and drain valves when dumping. Sufficient liquid in the tank causes a swirling action that
should take any accumulated solid wastes with it.
Accumulation of solid wastes in the black-water tank can be avoided by keeping the gate valve closed when
connected to the sewer connection. If the valve is open, solid wastes may accumulate in the tank which may
eventually result in costly repairs.
11-9
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