DIY Backflow Sprinkler System

All sprinklers systems need a backflow prevention device. These are important pieces of safety equipment that keep the water that has already entered the sprinkler manifold or supply lines from flowing back into the main water line. This is critical because water that enters sprinkler pipes is no longer considered to be potable. The most common type of backflow prevention device is a pressure vacuum breaker, which must be installed at least 12 inches above the highest point on the sprinkler system to work properly.

Pressure vacuum breaker
PVC glue
PVC 90-degree elbows
PVC pipe (at least 3 feet)
Adjustable wrench

Instructions

- 1
  Locate the area where the main supply pipe exits the house to the sprinkler system. This is usually where you plan to install the sprinkler manifold.
- 2
  Apply a thin layer of PVC glue to the inside of a 90-degree PVC adapter, and press one end of the adapter into the inlet hole on the manifold. Make sure the other end of the adapter is pointed straight up.
- 3
  Apply a thin layer of PVC glue to the outside edge of a piece of PVC pipe that is about 3 feet tall. Press the pipe into the exposed end of the adapter on the manifold.
- 4
  Apply a layer of PVC glue to the inside of a male PVC adapter, and press the piece onto the exposed end of the pipe.
- 5
  Screw the base of the pressure vacuum breaker's outlet valve into the male adapter until the unit is snug. Tighten the connection with a wrench as needed to make the connection watertight.
- 6
  Loosen the compression nut on the bast of the vacuum breaker's inlet valve, and slide the main water line into the inlet valve on the vacuum breaker by tightening the compression nut with the pipe inside of the valve. The breaker is now attached and will prevent water from flowing backward into the main line.

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