How Much Does Sydney RPZ Valve Testing Cost? We explain what is required for commercial properties in Sydney


How much does an RPZ Valve Cost?

A RPZ Valve will cost between $1,000 and $3,000 depending on the size of the property it has to service. Property sizes will require different size copper mains pipes that can vary greatly in size for different applications depending on what it is feeding & the materials required e.g. commercial building vs single story house vs a block of units 

How much does RPZ Valve Testing in Sydney Cost?

An RPZ Valve Test in Sydney will cost between $200 and $300 depending on the location, time of day & type of property.

How can you get an RPZ Test Report?

Nu-Trend is a certified RPZ Testing Plumber and when we provide our RPZ Testing Service we will submit the results to Sydney Water for processing. We can also provide you a written test report for your own records.

How much does RPZ Valve Installation Cost?

You can get an RPZ Valve installed for $500 to $800 but this will depend on the valve used and labour required. Depending on the situation this can vary between 2 and 8 hours based on access, the property type, size of the valve and required plumbing changes.

Does RPZ Plumbing have to be changed?

In most situations the surrounding plumbing will need to be changed to accomodate a new RPZ Valve to make it suitable for approval.

What are the RPZ Valve Servicing Requirements?

It is recommended that an RPZ Valve is serviced at least once a year.

What is RPZ Testing?

Nu-Trend is certified to provide RPZ Testing in Sydney. We use specialised back flow testing equipment that is specifically calibrated to test devices. We can then provide a written assessment about the device’s performance.

How can you install a RPZ Backflow Preventer?

You need to use a licensed plumber to install a RPZ Backlow Preventer. Nu-Trend is a licensed plumber in Sydney that can install all types of plumbing items for commercial or residential applications.

Nu-Trend is a qualified Plumber and licensed Backflow Technician that can help commercial property owners ensure their kitchen, restaurant or cafe are compliant with current regulations.

We were called to a site because the owner of the restaurant received a letter from Sydney Water to install a Backflow Test Device for the property. It is compulsory for a restaurant, laundromat or hospital to have this device installed. These type of commercial working areas are classified as high hazard which requires a high hazard Backflow device such as an RPZD needs to be installed. 

This valve protects the Sydney Water mains from any back charge that may occur in the line in the rare case of disinfectants, cleaners, oils or grease are syphoned from the property, kitchen or grease trap areas during cleaning or maintenance. 

The valve has two testable check valves, which close when they sense a Backflow in water pressure. It also has a vent on the bottom which expels any residual water in the valve when this occurs, meaning the valve is more suitable outside, but can be installed indoors with a tub dish drain beneath the vent. 

On inspection of this property we found one valve needed to be installed on the main water meter. Another two valves needed to be installed on the two hose taps closest to the grease trap, as these taps would be considered high hazard because they could be used for cleaning during maintenance of the grease trap. 

The valves will need to be tested annually to ensure the check valves and vent are in working order. 

The type of backflow prevention device you require will depend on your site

The hazard rating of your site’s processes will determine which type of device you need to install. If the hazard rating varies due to multiple processes, you must apply the highest hazard rating.


Reduced pressure zone device (hazard rating – high)
This device has two independent action, non-return valves that are force-loaded to the closed position. A relief valve is positioned between the non-return valves and is arranged to be force-loaded to open to the atmosphere.


Break tank/air gap (hazard rating – high)
This device has an air break (physical gap) between the lowest water service pipe outlet and any upstream tank, fitting or container.


Testable double check valve (hazard rating – medium)
This device has two independent action, non-return valves that are force-loaded to the closed position. It is fitted with three test taps for yearly testing.


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Rick and Rob are the hands-on Directors for Nu-Trend Plumbing. Rather than hire sub-contractors and manage their business from a distant office, they are on the tools, at your site & working towards delivering your bathroom renovation or plumbing service. It means you are talking directly to the owners of the business, the guys who are accountable and responsible rather than via email or through customer service teams.

It is why they are able to provide a written guarantee that demonstrates their confidence in standing by the quality of their workmanship and the service they deliver to every single client.

They have a very single minded commitment to deliver a high level of professionalism and quality.

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With so many years in the trade, the Nu-Trend team has seen their fair share of sales tricks, special offers, promotions and other gimmicks to secure business. Rather than copy what everyone else is doing they decided a long time ago to avoid all the typical gimmicks and stick to clear, upfront information and pricing, including the provision of free Quotes. 

Here are the most common sales gimmicks you will see and how they work, keep in mind there is a reason most service industries don’t disclose fixed prices.

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Nu-Trend since 2009

Nu-Trend was formed just over 10 years ago by father and son team, Rick and Michael Karagiannis.

Michael has been in the industry for more than 20 years, passing his knowledge and expertise to Rick as the family tradition lives on.

Rick has always enjoyed the finer elements design details. Not content with solving plumbing problems he soon broadened his skills to also do bathroom renovations in Sydney. A perfect match with hundreds of reviews later & beautiful bathrooms being enjoyed by hundreds of people.

Rick Karagiannis - Plumber & Bathroom Renovator

Rick Karagiannis - Plumber & Bathroom Renovator

Rick Karagiannis is a licensed Plumber, Building Renovator and Director of Nu-Trend, a Sydney Plumber and Bathroom Renovations contractor. Nu-Trend has been operating since 2009 as an independent sole trader in Sydney. Rick provides all types of services for small bathroom renovations, leaking tap repairs, hot water high-pressure jet blasting and more.