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You may already know that anti-siphon and/or back-flow prevention devices are widely required, but you may want to know why. The answer is, "contamination." Anytime a hose is placed in a yard or an underground sprinkler is operated, there's a chance for contaminants -- such as pet excrement, fertilizer, lawnmower gas, etc to enter the line. Without anti-siphon or back-flow prevention, these contaminants could be sucked into the source water, where they may be ingested in drinking water.

The anti-siphon valve is located on the outlet of the pump. This strategic location works against gravity and prevents draining on the tank. The valve opens when pressure is applied from the pump and then closes airtight at the moment the pump pressure ceases to flow. The anti-siphoning valve will close more tightly when negative drainage occurs.

Anti- siphon valves are not only meant to restrict the contaminants going into the tank instead, these also keep thieves away from stealing the gasoline from other tanks. This is possible only because of the non-wet u-cup seal located around the tank that provides the tank with the vacuum-tight sealing.

Before commencing the project, be handy with all the tools and equipments needed to accomplish the project more easily and effectively. Like in this case you'll need like plumber's wrench, shovel, and Teflon pipe tape.

At first, turn on the lawn sprinklers so as to fill them with water. Having filled them, just turn the water off to the lawn sprinkler.

Now we need to shut off the water supply running up to the pipe which is further directed to your house. Having done this, hollow out the piping located near the anti- siphon valve. Use a plumber's wrench to detach the pipe connected to the valve.

Remove the sprinkler head. Watch for water to flow out of the pipe that you opened. If there is water flowing, then your anti-siphon valve has failed. If there is none and water is still standing in the pipe that the sprinkler head attached to, then it is working properly.

Wrap Teflon pipe tape two to three times around the threads of the pipe you opened and reattach the pipe by turning it clockwise with your plumber's wrench.

Scott Rodgers is a fine expert who has been authoring on plumbing for a long time now. His skill has given inspiration to a host of workers, ranging from Buffalo Grove Plumbers (Need one?click here!) to Fort Sheridan Plumbers (Need one?click here!).

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