Installation Guide
9
ENGLISH
1.  Shut off the water supply. Flush the toilet and remove 
any remaining water from the tank. Remove the old fill 
valve.
2.  Install new fill valve by sliding the threaded portion of 
the shaft through the hole in the bottom of tank.
3.  Thread mounting nut onto exposed shaft under the 
tank/bowl and tighten nut.
 WARNING! Do not over-tighten.
4.  Connect the water supply (see Ill. 1 or Ill. 2). Pipe dope 
is not recommended. Attach the refill tube to the 
valve and clip the other end to the overflow pipe.
Water Level Adjustment
1.  Remove the tamper proof key (see Ill. 3) and turn the 
upper half of the valve counter-clockwise to unlock it 
(see Ill. 4). Pull up the valve and set it to the desired 
water level, then turn it clockwise until the valve snaps 
into the locked position.
2.  Turn on the water supply.
NOTE: The tamper proof key is optional and may be used 
to prevent further adjustment.
Fill Valve Servicing Instructions
1.  Turn off the water supply, then flush 
the toilet.
2.  Snap off the cover (see Ill. 1).
3.  Gently press the float arms inward 
and remove the float (see Ill. 2).
4.  While holding the valve with one 
hand, twist the cap 1/8 turn counter-
clockwise and remove it (see Ill. 3).
TOILET TANK FILL VALVE INSTRUCTIONS 
FILL VALVE/ FLUSH VALVE SERVICING INSTRUCTIONS 
CST405MF & CST406MF
Replacement Procedure
Gasket
Tank Wall
Mounting
Nut
Flanged
Supply Line
Coupling
Nut
Flat
Washer
Gasket
Tank Wall
Mounting 
Nut
Cone
Seal
Flat Washer
Coupling 
Nut
Copper Tube
Ill. 2
Ill. 1
Lock
Unlock
Ill. 3 Ill. 4
Ill. 1 Ill. 2
Ill. 3
5
Ill. 4










