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CESCO's various toilet fill valves and accessories are precise but simple devices. Routine maintenance tasks and repairs using genuine replacement parts require limited skills. However, accurate diagnoses of toilet malfunctions are seldom easy. Proper functioning depends on installing the correct replacement parts and making sure that all parts work well together.

CESCO BRASS includes installation instruction with each anti-siphon fill valve shipped. Countless information sources are available on troubleshooting toilet problems. While many of these sources are informative for routine maintenance tasks, CESCO's recommendation is as follows: For best results, these products [CESCO's and all other toilet fill valves, flush valves and other major toilet repairs parts] should be installed by a plumbing professional.

The steps to take in identifying and solving gravity flow toilet tank problems are outlined below:

The diagram below shows the typical toilet tank component as installed.
The fill valve represented is the BURLINGTON model 20A

A - Coupling Nut
B - Locknut
C - Shank
D - Duckbill Check Valve *
E - Refill Tube/Connector/Clip
F - Float
G - Cone Shank Washer
H - Float Rod
I - Lever Assembly
J - Plunger Assy (includes K)
K - Sealing Ball
L - Thumbscrews
M - Volume Regulator **
N - Overflow Tube
O - Tank Ball (or Flapper)
P - Flush Valve Seat
Q - Flush Valve
R - Tank Lever

* only on "A" type anti-siphon models
** only on Model 20A (regulator on Model 16 is top mounted)

For additional information review the on-line FAQ (Frequently Asked Questions) database.

Fill valve does not shut off Water flows over top of overflow tube (sprinkling talcum powder on top of water will give positive proof) 1. Obstruction, inhibiting free movement of plunger, levers, float rod or float ball
1. Check clearances and bend/adjust float rod to avoid hitting end/side of tank, flush valve mechanism, and tank top
2. Float ball lost buoyancy (water inside) 2. Remove float, shake and replace if water inside
3. Wear and/or debris from water supply prevents the valve from shutting off 3. replace entire ballcock or disassemble level and plunger assembly to remove debris, including nylon seat (if damaged). Repair kits are available for all wear parts.
Fill valve does not shut off Water does not flow into overflow tube Internal siphon may have resulted if refill tube was installed below water line Re-install refill tube with discharge end clipped above actual water level in the tank
Fill valve does not shut off Water does not flow into overflow tube and the fill valve shuts off with a gentle, manual lifting of the float rod Leakage at flush valve seal (flapper or tank ball) flush valve/tank bolt gaskets [add food coloring or grape juice to tank water to verify leakage] If trip lever, linkage and chain function properly (allowing the seal to seat), shut off supply stop under the toilet, make a pencil mark at water level in tank and do not flush toilet for an hour (or overnight), then observe*
* with supply stop fully closed, water level in the tank does not drop Confirm that trip lever, linkage and flapper or ball function well every time; 1/4" slack in chain, good alignment & no obstruction Problem most likely involves a malfunction of the fill valve Repair or replace fill valve
* with supply stop fully closed, tank water level drops [color added to tank] leakage from toilet's tank to bowl is visible Leaks at tank ball or flapper seal, or (if water drains below flush valve seat) at flush valve cone washer or tank bolt washers Install new tank ball or flapper, and (if tank drains below flush valve discharge rim) remove tank to replace flush valve and install new tank bolts & washers


Barry E. Walter Sr. Co. 2550 East Platte Avenue - Fort Morgan, CO 80701 - 800-767-5552

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