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Backflow Prevention

Backflow is a reversal of the normal direction of water flow in a water supply plumbing system.

It occurs when the water delivery main is at a lower pressure than the internal plumbing system (back siphonage). Back siphonage can occur when there is a burst or ruptured water main, or due to excessive demand during fire-fighting operations or other periods of high demand.

Backflow can also occur if a water pump, such as a bore pump, is cross connected to the internal water plumbing system, and is pumping bore water at a higher pressure than the water mains pressure (back pressure).

If a property’s drinking water supply is inadvertently connected with a source of pollution, either through a cross connection or simply a hose submerged in a container of liquid, then these pollutants could enter the water supply when there is an overpressure on the private property side or a sudden drop in water mains pressure.

  • Brass Dual Check Valve/ Backflow Preventer Size: 20mm Brass Dual Check Valve/Backflow Preventer, 25mm Brass Dual Check Valve/Backflow Preventer
    Brass Dual Check Valve/ Backflow Preventer Size: 20mm Brass Dual Check Valve/Backflow Preventer, 25mm Brass Dual Check Valve/Backflow Preventer
    Original price $55.07 - Original price $55.07
    Original price
    $55.07
    $55.07 - $55.07
    Current price $55.07

    Brass Dual Check Valve/ Backflow Preventer

    Brass Dual Check Valve/ Backflow Prevention FF Use the Dual Check Valve for backflow prevention from your irrigation system to the mains water supp...

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  • Hose Bib Vacuum Breakers Size: 20mm Hose Bib Vacuum Breaker, 25mm Hose Bib Vacuum Breaker
    Original price $30.98 - Original price $38.90
    Original price
    From $30.98
    $30.98 - $38.90
    Current price $30.98

    Hose Bib Vacuum Breakers

    Hose Bib Vacuum Breakers Attached to sill cocks, valves, and hydrants with Male hose thread outlet. For indoor or outdoor use. Designed to prevent ...

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  • Test Cock for Backflow Prevention Devices Size: 1/8" male x 1/4" female, 1/4" male x 1/4" female
    Original price $96.53 - Original price $96.53
    Original price
    $96.53
    $96.53 - $96.53
    Current price $96.53

    Test Cock for Backflow Prevention Devices

    Test Cock for Backflow Prevention Devices TC14 & TC18 No lead cast brass test cock ball valve, with screwdriver slot stem for actuation. 1/8" ...

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  • Conbraco Brass RPZ Devices Size: 20mm Brass RPZ Devices, 25mm Brass RPZ Devices, 32mm Brass RPZ Devices, 40mm Brass RPZ Devices, 50mm Brass RPZ Devices
    Conbraco Brass RPZ Devices Size: 20mm Brass RPZ Devices, 25mm Brass RPZ Devices, 32mm Brass RPZ Devices, 40mm Brass RPZ Devices, 50mm Brass RPZ Devices
    Original price $635.25 - Original price $1,353.00
    Original price
    From $635.25
    $635.25 - $1,353.00
    Current price $635.25

    Conbraco Brass RPZ Devices

    Conbraco Brass RPZ Devices The Apollo Series 40-200 Reduced Pressure Principle Backflow Preventer is designed to give maximum protection against ba...

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  • Conbraco Brass Double Check Devices Size: 20mm  Brass Double Check Devices, 25mm  Brass Double Check Devices, 40mm  Brass Double Check Devices, 50mm  Brass Double Check Devices
    Conbraco Brass Double Check Devices Size: 20mm  Brass Double Check Devices, 25mm  Brass Double Check Devices, 40mm  Brass Double Check Devices, 50mm  Brass Double Check Devices
    Original price $390.23 - Original price $907.50
    Original price
    From $390.23
    $390.23 - $907.50
    Current price $390.23

    Conbraco Brass Double Check Devices

    Conbraco Brass Double Check Devices The Apollo Series 40-100 Double Check Valves are designed to prevent contamination of the potable water supply ...

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