3
PLUMBING CONNECTIONS
TMC marine toilets may be installed above or below the waterline.
Connect inlet hose using 25mm(1”) ID hose. Make sure all inlet connections are airtight
and free of sharp bends or restrictions.
Connect 25mm(1”) hose to discharge port and make suitable connection to holding tank or
other discharge system. Avoid sharp bends or restrictions.
For above waterline installations, a check valve (optional) may have to be installed in the
flush water intake line to ensure rapid pump priming. To retain water in bowl, make a loop
in the discharge line about 20 cm (8 inches) above base of bowl.
Do not connect inlet hose to a pressurized water system.
If the toilet is, or can be, below waterline at any normal (including static) attitude of vessel
heel and / or trim, a 1” vented loop fitting must be installed in the inlet pipe work. The
vented loop fitting must be positioned so it always remains above the waterline at all angles
of heel and trim.
Vented loops installed below water line are required to prevent backflow of the waste.
The waste can be stored in the holding tank first then discharged to pump out station at the
port.
out
in
Deck Pump Out
Holding Tank
Fig. 2 below waterline
out
in
Deck Pump Out
Holding Tank
Macerator or Waste Pump
Y Valve
Check Valve
Y Check Valve
Vented Loop
Fig. 1 above waterline
