User Guide
Water Saving
Refill Module
Fluidmaster’s Patent-
Pending Water Saving
Refill Module boosts
performance when
combined with
Fluidmaster’s PerforMAX
TM
FILL VALVE 400ARHR.
Step 2: Remove the tank
lid. Mark the current
water level in your tank.
Flush your toilet once.
Make a mark at the
residual water level left
inside the tank. Flush your
toilet a second time to drain
the water from the toilet
tank. If necessary, sponge
out any remaining water.
RESIDUAL
WATER LEVEL
CURRENT
WATER LEVEL
Items Needed
- Sponge or Towel
- Pliers (Optional)
- Pencil
A
A
B
B
C
C
Step 3: Remove the
existing flapper, chain and
flush handle assembly
from your tank. When
removing the FLUSH
HANDLE, note that the
LOCK NUT may be
reverse-threaded, so you
need to turn it clockwise
to loosen it.
Step 4:
Remove the old
fill valve assembly.
DUO FLUSH
TM
VALVE OVERVIEW & PREPARATION INCOMPATIBILITIES / SPECIAL NOTES SHUT OFF WATER
SECTION 1: MARKING WATER LEVELS & REMOVING OLD PARTS IDENTIFYING YOUR FLUSH VALVE SEAT
Adjustment
Dials
Roller
Clamp
Dual
Action
Handle
Flush
Cable
Flush
Handle
Actuator
PerforMAX
TM
Fill Valve
Fill Valve
Refill Tube
Overflow
Pipe
Overflow
Hose
Overflow
Hose Clip
Snap-On
Mount
Flush
Valve
Seat
Step 1: Shut off the
water supply beneath
your toilet by turning the
valve clockwise.
CLOCKWISE
REMOVE
OLD
FILL VALVE
PARTS OVERVIEW
There are 5 main
components
included in this
box. Each of
these
components are
contained within
color-coded bags
with a
corresponding
letter.
To identify a part
within the box,
look for the
letter and color
on each bag that
corresponds with
the parts listed
to the right.
Dual Action Handle (Handle)
The DUAL ACTION HANDLE will allow you to flush
UP for a half flush and DOWN for a full flush.
D
PART
Brass Seat Adapter
The BRASS SEAT ADAPTER is only necessary
if you have a BRASS FLUSH VALVE SEAT.
C
PART
DUO FLUSH
TM
Valve
The DUO FLUSH
TM
Valve saves water by
allowing you to choose between half and full
flushes.
A
PART
Angled Seat Adapter
The ANGLED SEAT ADAPTER is only necessary if
you have a plastic ANGLED FLUSH VALVE SEAT.
B
PART
PerforMAX
TM
Fill Valve
The PerforMAX
TM
Fill Valve maximizes system perfor-
mance. It replaces the fill valve currently in your tank.
E
PART
INSTALLATION GUIDE
DUO FLUSH
TM
30800 Rancho Viejo Rd.,
San Juan Capistrano, CA 92675
www.fluidmaster.com
800.631.2011
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Visit www.duoflush.com for
easy-to-follow installation videos
and additional troubleshooting tips.
CLOCKWISE
TO LOOSEN
LOCK NUT
REMOVE
FLUSH HANDLE
AND FLAPPER
PART# 25-0173, Grev. 3, 12/11
System
Step 5A: Identify the
type of FLUSH VALVE
SEAT you have in your
tank. If your plastic
OVERFLOW PIPE has a
FLAT SEAT as pictured
above, proceed to Section
4 on the back side of this
instruction guide.
This device is not intended to be used as a retrofit device for
1.28 gpf water closet.
Performance may vary since product was not tested on all
models of water closets.
Step 5B: If your plastic
OVERFLOW PIPE has an
ANGLED SEAT, locate and
remove the ANGLED SEAT
ADAPTER from the yellow
bag labeled “B.” Follow
the installation
instructions below for
SECTION 2.
Step 5C: If your
OVERFLOW PIPE is brass,
locate and remove the
BRASS SEAT ADAPTER
from the orange bag
labeled “C.” Follow the
installation instructions
below for SECTION 3.
BRASS SEAT
FLAT SEAT
ANGLED SEAT
3”
Flush Valves
3”
Certain 1-piece toilets
with Low-Boy tanks
(less than 8” in height)
Kohler Side-
Mount Valves
Requires installation of 2" flapper
flush valve (not included).
Can be replaced with
Fluidmaster’s 507 Flush Valve.
Ballcock
Fill Valves
Mansfield
Flush
Valves
Can be replaced with
Fluidmaster’s PerforMAX
TM
FILL
VALVE 400ARHR.
The systems and components shown here are not
compatible with the Fluidmaster DUO FLUSH
TM
Valve.
Step 12: Wipe down the
BRASS FLUSH VALVE SEAT
before installing to check
for mineral build-up. If
the OVERFLOW PIPE is
threaded on (some are,
some aren’t) make sure
it’s tight by twisting
clockwise before
installing the BRASS SEAT
ADAPTER.
SECTION 2: INSTALLING THE ANGLED SEAT ADAPTER
Step 6: Prior to installing the
ANGELED SEAT ADAPTER
make sure the bottom of the
tank and flush valve seat are
dry.
Step 7: Remove paper from
sealant ring located on the
bottom of the ANGLED SEAT
ADAPTER. Do not remove
SEALANT RING.
Step 11: Check for flat
surface on seat. Any
damage to seat will
require replacement of
the entire brass seat with
Fluidmaster’s 507 Flush
Valve.
Step 8: Locate yellow
arrow on the back of the
ANGLED SEAT ADAPTER.
Step 9: Align yellow
arrow on ANGLED SEAT
ADAPTER directly toward
the plastic OVERFLOW
PIPE.
Step 10: Firmly press the
ANGLED SEAT ADAPTER
onto the flush valve seat
as shown above.
Proceed to Section 4.
Step 13: Slide the BRASS
SEAT ADAPTER down the pipe
and snap it to the FLUSH
VALVE SEAT as shown.
Proceed to Section 4.
SEATED
ANGLED FLUSH
VALVE SEAT
OVERFLOW
PIPE
REMOVE PAPER
SECTION 3: INSTALLING THE BRASS SEAT ADAPTER
ALIGNMENT
ARROW
ALIGNMENT
ARROW
SEATED
SEAT
SURFACE
MUST BE
FLAT
PROCEED TO INSIDE PAGES
FOR NEXT STEPS
SEALANT
RING
WARNING
DO NOT USE IN-TANK DROP-IN TOILET BOWL CLEANERS
CONTAINING BLEACH OR CHLORINE. Use of such products
will: (1) RESULT IN DAMAGE to tank components and MAY
CAUSE FLOODING and PROPERTY DAMAGE and (2) VOID
FLUIDMASTER WARRANTY. DO NOT overtighten nuts or
tank/ bowl may crack.