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Chesprocott Health District - News: Why is it important to recognize and conform to anti-siphon codes?
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Section: Frequently Asked Questions
Why is it important to recognize and conform to anti-siphon codes?
Last Update: Sep 03, 2002

NOTE: Plumbing codes throughout the U.S. and Canada mandate the installation of anti-siphon toilet fill valves in all gravity flow toilets (new installations, retrofits, and replacements). The primary standard referenced in the U.S. is the ASSE 1002 Standard (Rev. 1999) and the similar CSA Standard B125 in Canada. Certification testing against these standards referenced in virtually all model codes adopted by various jurisdictions must be conducted by an ASSE Approved Test Laboratory.Under certain adverse conditions, toilet fill valves can be an “indirect cross-connection point” between the potable (drinking) water and non-potable water. Beyond the valve seat of the fill valve, the device and tank are part of the drain system. If a toilet fill valve is open and/or malfunctions when conditions in the supply piping cause a reversal of flow direction (due to a supply pressure drop or vacuum), back-siphonage of non-potable tank water into the drinking water supply can result. Backflow prevention codes are widely enforced. Fines have been imposed for the sale and installation of non-conforming toilet fill valves. Installers, their suppliers, and building owners are vulnerable to potential claims and/or lawsuits resulting from drinking water contamination traced to a non-anti-siphon toilet fill valve. INCIDENTALLY: Toilet fill valves were among the first end use water supply outlets designed to prevent back-siphonage of contaminates into drinking water. The first ASSE 1002 Standard was released in 1964. CESCO BRASS (Scovill and Burlington products) designed and produced anti-siphon ballcocks for at least 25 years before the ASSE Standard was developed.

FAQ Introduction
Common Toilet Troubleshooting Steps and some Frequently Asked Questions.
How long should it take to fill the tank and how can that be regulated?
The time to fill the tank varies with the design and size of the tank.
Why do toilet suppliers caution against over-tightening the nuts on toilet tank fixtures and trim?
Toilets are made of vitreous china, an exceptionally strong and durable material but one that can crack if subjected to a sharp impact or excessive stress.
What is the best way to adjust the water level in the tank?
The techniques vary by design among toilet fill valves.
Why must the refill tube always be kept above the water level?
How important is it to flush the line before or when installing a replacement toilet fill valve?
What are the leading causes of premature failure of all toilet tank fittings and what are the implications?
Considering Cutting the Overflow Tube Below the C-L Marking on the Fill Valve?
Some fill valve suppliers and "how to" guides recommend cutting the overflow tube at 1" below the C-L mark on the valve. When should this be done?
Conformance with anti-siphon installation requirements of the ASSE 1002 Standard
Why does the critical level (C-L) mark of a toilet fill valve have to be a minimum of 1" above the top of the overflow tube (flood plain) to be in conformance with anti-siphon installation requirements of the ASSE 1002 Standard?
What is water hammer, why is it a problem, and what can be done to eliminate it?
Water hammer is the instantaneous increase in water pressure that occurs when water flowing in a pipe stops abruptly (as with a snap action valve closing).
Why does CESCO suggest that toilet repairs should be done by licensed plumber?
Should plumber’s putty, thread sealant, grease or lubricants ever be used in the installation or repairs of toilet fill
What is the least understood and most ignored routine maintenance tasks?
Why is it important to recognize and conform to anti-siphon codes?
What is thermal expansion in residential water supply pipes, why is it a problem, and what is the solution?
Why do many leading suppliers of [plastic] fill valves disclaim responsibility/reliability from product failures?
How much water should be in the bowl after the flushing cycle is completed and the fill valve shuts off?


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