Section 6 --- Water Systems
Cayman 2005
216
Waste Drain & Sewage Tanks
The waste drain system provides adequate and safe storage and/or discharge of waste materials. The
drain system uses ABS plastic piping and fittings connected to sinks, shower, toilet and holding tanks
draining to an outside termination. The motorhome should be reasonably level for optimum opera-
tion of the waste systems. The wastewater holding system consists of a grey water tank that stores the
sink, shower and laundry washer drain water, and a black holding tank that stores waste from the toilet.
Drain valves and a tank flush system dispose waste through a common termination. Each holding tank
has a separate drain valve dumping the waste water (grey water) and sewage (black water) through a
common single discharge outlet. The tank drain valves are located in the roadside service center. Use
service bay monitor or systems control center to monitor tank levels. When ready to drain the tanks,
drain the sewage tank first. Next, flush the black tank with the flush system. Close black tank valve
after flushing tank. Drain the grey water tank. Using this sequence helps to flush solids from the sewer
hose. When traveling, it is recommend both holding tanks be empty or less than half full.
Waste Drain Hose - Standard
A flexible three-inch sewer hose attaches between the termination drain and the shore facility. The
termination drain is adjustable and should be periodically exercised. Sewer hoses usually come in
10 or 20 foot lengths. The sewer hose is stored in a tube accessed through a door in the roadside serv-
ice center. The shore fitting for the sewer hose may be a three or four-inch, male or female thread pipe;
or a four-inch pipe with no threads, covered by a metal plate. Different adapters are available to fit
most configurations. Hose ladders may also be purchased to support the hose.
It is important that the hose remains secure. Always tighten clamps and restraining devices
before use. Lay the hose inline between the termination outlet and the shore fitting. Restrain the hose
to prevent movement during use. Wear protective and/or disposable gloves when handling the sewer
hose.
To Exercise the Termination Drain:
• Grasp the drain firmly on both sides of the drainpipe.
• Swivel the pipe up and down several inches to exercise the internal O-rings.
• The drainpipe may be left in the upward position to prevent residual material from leaking
out.
To Attach the Hose:
• Remove sewer hose from carrier.
• Remove termination cap. Align coupler tangs
with termination tabs. Twist coupler clockwise 90º
locking coupler to termination outlet.
• Unscrew the access deck plate and feed the drain
hose through the opening.
• Rotate the drainpipe downward for maximum
flow.
040422A
SEWER HOSE
Plumbing Service
Center on roadside
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