How To Drain Backflow Preventer

A backflow preventer is a device used to stop the flow of water or other fluid substances in the wrong direction. It is placed between the water supply and the fixture to be protected. In most cases, it is installed on the water main coming into the home.

How To Drain Backflow Preventer

Draining a backflow preventer is an important part of maintaining the device. If water accumulates in the preventer, it can corrode the parts and reduce the effectiveness of the unit. There are a few different ways to drain a backflow preventer, depending on the type of unit you have. If you have a gravity-type backflow preventer, you can simply open the valve at the bottom and let the water flow out. If you have a pressure

A backflow preventer is a device that is installed in water systems to prevent backflow. Backflow is the flow of water or other fluid substances in the reverse direction of the normal flow. In order to drain a backflow preventer, you will need a bucket, a hose, and a screwdriver. The first step is to remove the screw that holds the cover in place. Then you can use the hose to direct the water into the bucket.

  • Shut off the water supply to the house. this is usually done at the valve near the water meter
  • Open a f
  • Locate the backflow preventer. it is usually located near the water meter

-Check that the backflow preventer is properly installed before draining it. -Open the valve at the bottom of the backflow preventer. -Slowly drain the water until it is completely empty. -Close the valve at the bottom of the backflow preventer.

Frequently Asked Questions

Should You Remove Backflow Preventer In Winter?

Generally, no. The main reason to have a backflow preventer is to protect the public water supply from contaminants, and in most cases those contaminants are more prevalent in the winter. Removing the backflow preventer could actually increase the risk of contamination.

How Does A Backflow Drain Work?

A backflow drain is a plumbing fixture that helps to prevent wastewater and other contaminants from flowing back into the water supply. It works by using a gravity-fed system to direct wastewater and other liquids down and away from the building, and then into a designated drainage area.

How Does A Sewer Backflow Preventer Work?

A sewer backflow preventer is a mechanical device used to prevent wastewater from flowing backwards into the sanitary sewer system. It typically consists of a gate or valve that is installed in the sanitary sewer line upstream of the point where it connects to the drainage system. When wastewater begins to flow back into the sanitary sewer, the backflow preventer is activated and closes off the flow of wastewater.


Always refer to the manufacturer’s instructions for your backflow preventer on how to properly drain it. In general, you will need to locate the drain valve on the unit and open it. Some units have a hose fitting that you can attach a garden hose to in order to direct the water away from your property. Others may require you to remove the entire unit in order to empty it out.

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