Gemini 105Mc Owner’s Manual
9Copyright © 2004 Performance Cruising Inc.
Plumbing, Head, & Water Systems
Shower Sump Pump
The shower in the Gemini is mounted to the wall
with a door that can be opened to close off a sepa-
rate area for showering and leave a dry area for
clothes and towels.
The shower water collects in the sump which is capa-
ble of holding (6) six gallons. To empty the sump
press the switch on the wall below the sink. The
pump is a Gulper 220 under the floor of the naviga-
tion station. This pump is self-priming and drains the
grey water directly overboard. The pump is power-
ful enough to serve as a auxiliary bilge pump. Simply
disconnect the shower hose and connect a second
hose.
Toilet
The toilet is a Raritan PHII, (Practical Sailor recom-
mended). This is a marine toilet with a lever handle
that gives a mechanical advantage making pumping
the toilet easier. An electric motor can be added to
pump the toilet; however this is not an option from
the factory.
The pump has a dial, which is turned counterclock-
wise to flush the toilet and clockwise to close the
incoming water to pump the toilet dry. Caution:
When sailing and pitching in rough water, always
close this dial on the top of the toilet pump to stop
water flooding back into the toilet and flooding the
boat.
A ¾” inlet seacock and 1½” outlet seacock are be-
hind and below the toilet. With the handle to the
left the ¾” inlet seacock is allowing water in from
the sea. With it coming straight out it is closed and
with the handle pointing to the right it is allowing
fresh water to be pumped into the toilet from the
sink. Pumping fresh water into the toilet is to pre-
vent odor from the bacteria in seawater when the
toilet is left for a long period of time.
To use the fresh water flush, set the 3-way seacock
located in a cabinet just outside the head, opposite
the navigation station, to “Fresh Water Flush.” This
seacock controls the drain from the sink and has
three positions: Off, Overboard, and “Fresh Water
Flush.” In order to pump fresh water from the sink
into the toilet: fill the sink with water, turn the sink
seacock to “Fresh Water Flush,” turn the 3/4” toilet
seacock to the right, and pump the toilet flush han-
dle until all the water from the sink has been sent
through the system. You can add a small amount of
bleach to the water to further clean the lines out.
The Y valve behind the toilet directs the toilet wa-
ter either overboard or into the holding tank. (The
long end of the handle points to the hose in use; i.e.
pointing right pumps overboard and pointing left
pumps into the holding tank.) Below are all the pos-
sible valve configurations for the toilet:
* See overview illustration on page 11
Holding Tank
The holding tank is located directly behind the toilet
and is on the same level as the sail locker base. The
holding tank is 18 gallons with a 1 ½" inlet at the top
against the outside of the hull. The 1 ½" outlet is at
the bottom against the outside hull. The vent is on
the same side with a ½" hose going across the tank
to a through hull fitting under the sink. The holding
tank can be inspected visually through the Plexiglas
bulkhead in the sail locker. It may be necessary to
shine a flashlight behind the toilet from the other
side of the tank to illuminate the fluid at the same
time.
In the top of the tank is a 4" inspection cover. The
tank can be inspected by unscrewing the top shelf in
the sail locker. The tank can be removed through the
sail locker by cutting the marine sealant tabbing that
holds the vertical Plexiglas wall below the shelf in
the sail locker.
Combination Shower Pump /
Bilge Pump System
Your new Gemini 105Mc comes with an upgraded
Overboard
Into Holding Tank
Gravity Drain Holding Tank
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