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

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
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100% Guarantee
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National Plumbing

Backflow Testing

Backflow Testing
Backflow Testing
5 Star Reviews
5 Star Reviews
100% Guarantee

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Backflow testing

National Plumbing can do backflow testing and repairs plus lodge registrations.

RPZ Valves
RPZ Valves

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 RPZ Valves located?

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

  • 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 stations
  • and more …
5 Star Google Business Reviews

Very Professional!

Leigh and Ben were very professional and worked hard to make the repairs and then complete a thorough clean up. The guys were friendly and informative and we were very pleased with the service provided. Certainly recommend these guys!

Big Shout-out!

Would love to take the time to say a great shout out to National Plumbing for the work that they had performed for me. Our Drains were clogged due to tree roots and the plumbers came out within the hour as the stars aligned. Great Service! Recommend!

Reliable - Highly Recommend

Highly recommended, professional, reliable combined with precise workmanship. Thanks Ben great job, much appreciated.

Fantastic, never disappoint!

National Plumbing was fantastic. We have used them a few times now and they never disappoint. Great Service and will recommend in the future.

Will Recommend to Friends

Great to see a plumbing service know what they are talking about. Found and fixed a water leak under concrete for me and cleaned up perfectly. Will recommend to friends in the future.