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Your local plumber. Your best choice for plumbing services in Brisbane and on the Gold Coast

icon_widget_image The team are ready all hours, 7 days a week. icon_widget_image GOLD COAST: West Burleigh Road Burleigh Heads, 4220 icon_widget_image BRISBANE: Oxford Street Bulimba, 4171 icon_widget_image 1300 246 627 icon_widget_image info@nationalplumbers.com.au



QBCC Lic: 15073983
ABN 72 618 680 541

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Backflow Testing

National Plumbing looks after all your gas fitting, leak detection and appliance commissioning.

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What is Backflow

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].

What is a RPZ Valve

Reduced pressure zone assemblies [RPZ Valves] are extremely important. They’re used to keep contamination or pollution out of your water.

Where are they located

This device is installed onto your plumbing system to protect drinking water and your water supply.

Common areas

  • Air conditioning towers
  • Irrigation areas
  • Fire hose reels
  • Ornamental Ponds
  • Swimming pools/spas
  • Vehicle maintenance pits
  • Dishwasher/glass washers
  • Bidets/bain-maries
  • Vehicle washing bays
  • Sullage pits/process tanks
  • Chemical injection areas
  • Dockside facilities/jetties
  • Boilers/steam pipes

Businesses we cater to:

  • Motels and unit complexes
  • Catering and allied industries
  • Hotels
  • Grease trap water washout.
  • Vehicle repair workshops
  • Shops and restaurants
  • Caravan parks
  • Medical surgeries 
  • Car and plant washing facilities
  • Dry cleaners and laundries
  • Hospitals
  • Clubhouses for sports etc.
  • Industrial installations
  • Schools, Day-care centres, and kindergartens
  • Abattoirs
  • Pest control vehicles
  • Chemical [storage] plants
  • Properties used for agricultural and horticultural purposes
  • Marinas, shop yards and boat building properties
  • Theme parks
  • Parks
  • Railway station