An anti-siphon device (ASD) or plumbing vacuum breaker (PVB) is used to help reduce the risk of contaminated water backing up in a plumbing system and entering into clean or potable water supplies. In the interior of a structure an anti-siphon device is often used to ensure that the toilet tank water does not end up
back in the clean water that is used to fill it. At the exterior of the building an ASD or PVB is required on fill valves for pools, sprinkler systems and all hose connections to keep potentially contaminated water from flowing back into the clean water through hoses.
Types of ASDs and PVBs to Choose From
There are several types of anti-siphon devices to choose from. You want to be sure that you are getting the best one for your situation and complies with any applicable codes for your area. There are models that are lead free and models that work on hot or cold water. If you do not purchase one that is right for your functionality, you may find yourself purchasing a replacement sooner than you would like. Choosing one that can handle the amount of pressure that will be put on it in the location of your choosing is also vital. The maximum pressure threshold for most devices is 125psi. Confirm the pressure that you will need for the area that you plan to use the device.
You will also find that you can choose one specially designed for hose connections and others that work for tub and shower hand spray sets if you so choose. It is important to decide where you want the safety measure to kick in before you can choose the right one for your home. You will also want to remember that if the connection is going to be in an area that is going to be cold and freezing, you want one that is freeze resistant in nature. You should also consider the lifespan of the device that you are purchasing. The better material and the higher the quality, the less likely you will be to have a fall-out of the system and replace it once again. Doing it right once is going to save you tremendously in the long run.
Cost Consideration for installing ASDs and PVBs
The price of an anti-siphon device or plumbing vacuum breaker can vary greatly depending on the type that you purchase. You might pay anywhere from $8 to $180 depending on whether you buy just the small part or the installation kit. The price will also be different depending on the type of material that the device is made from such as brass or plastic. You will find that the location will determine the type that you use, such as plastic might be used in a toilet where brass might be used for a hot water heater. Once you have decided on the location you will need to decide on the quality of the device and this will narrow down the pricing for you. If you are purchasing the device for use in your home you will want it to be made of a durable material. Consider purchasing a device with a warranty for individual parts on it.
Installation Options for ASDs an PVBs
If you choose to hire a professional to install the anti-siphon device, you will need to factor that into your prices. There are some excellent installation kits available that will include everything you need to complete the installation. It is important that you get the right kit for the area that you have chosen to install the device, whether it is in the toilet, on the garden faucet or in the basement at the water heater. Make sure that you purchase has the parts and the right device for the installation. Installation will really depend on where you are going to put the device.
One of the key components to remember when installing most anti-siphon devices in your home or outside of your home is that the installation point must be higher than the water level you are trying to protect against. This means that if you are going to install the anti-siphon device on a sprinkler system outside of your home, the device must be higher than the sprinklers so that it can work properly. You will want to install the device after the isolation valve or shut off valve for that particular water stream. So, if you install it on the inside of the home where water runs through, you want to install it at a higher point than the shut off valve. You essentially want to put it where it can stop the water after the shut off valve has done its job. Because it is a precautionary measure you want to make sure that it is a second line of defense after the shut off valve.
The process for installing a new anti-siphon device in your toilet is fairly simple, but needs to be done correctly. You will first want to make sure that you shut off the water to the toilet by using the shut off valve below or behind the toilet tank. Then flush the toilet and hold the handle until all the water has drained from the toilet tank. You will find the broken anti-siphon device in the toilet below the floatation device. You have to remove the floatation device from the toilet in order to get at the anti-siphon device. Take time to loosen the retaining nut that is holding the anti-siphon into place. Then remove the old anti-siphon.
Important Things to Consider about ASDs and PVBs
Once you have replaced the anti-siphon device in the toilet, you will want to use plumber’s tape to secure the bottom of the anti-siphon before connecting the supply tube for the water. After you have returned and tightened the coupling to hold it all in place, you can replace the floatation device. Some anti-siphon devices come with a flotation device of their own, saving you the trouble. Turn on the water and make sure that everything is working properly. You might need to tighten the coupling to get the toilet to fill properly and provide you with the right water supply to amply flush the toilet.