Gas Pex Couta Group

Pipe & Fittings.

The Water Pex Piping system || Frequently asked questions

What is Water Pex™?

The Water Pex™ piping system is available in 2 differing structures. These include:

1. Pex/Al/Pex

This is a five layered macro-composite construction and is the latest innovation for low pressure gas and water applications. The cross-linking carried out during the manufacturing process essentially links the molecular strands of the polyethylene forming a three dimensional structure. The cross linking creates a material that performs extremely well at high temperatures and pressures, making it perfect for plumbing and heating applications.

Water Pex™ Pex-Al-Pex pipe combines the benefits of both metal and plastic pipes. The inline welded aluminium tube is absolutely safe against oxygen penetration. It compensates for the snap-back forces and the linear expansion caused by temperature changes. The basis of the system is simple, safe and fast pipe installation: simply bend by hand, cut to length, ream and bevel, join together, screw or press, done.

This structure provides the pipe with the advantages of metal and plastic while avoiding their weaknesses, and brings the following benefits to plumbing

  • it is lower in cost when compared to conventional copper systems
  • it is lightweight, bendable and does not need to be welded
  • installation times are significantly reduced, saving labour costs
  • the product is hygienic, non toxic and smooth
2. Pex-b Multi-Purpose

The pex-b piping system is a lower cost general purpose piping system for water only. The inner layer of the pipe is constructed from pex-b material. Bonded to the pipe is an outer coloured layer that provides the product with increased UV resistance making it suitable for external applications. This piping system is available in a range of colours to make installation quick and easy and comply with National regulations. The available colours include:
  • Black Multi-purpose water pipe
  • Blue - Cold water
  • Red Hot Water
  • Lilac Recycled water
  • Green Rain water

Both systems have been independently tested and certified to demonstrate that they meet the requirements of Australian Standard AS 4176 and ATS5200.478 "Polyethylene / Aluminium and Cross-Linked Polyethylene / Aluminium Macro Composite Pipe Systems for Pressure Applications". In addition the manufacturing facilities are independently certified to ISO 9001.

The Water Pex™ Piping System is gaining an enormous acceptance amongst plumbers and gasfitters throughout Australasia due to it being a quality system that is fast, safe and easy to use and a valid replacement for copper, it also addresses many workplace health & safety issues not easily attainable when using other piping systems.

What tools do I need for the Water Pex™ Piping System?

Water Pex™ piping system has one type of crimp fitting for all applications therefore one type of hand crimping tool is available with four different crimping heads 16, 20, 25 & 32mm. Battery and electric tools are also available for use with 40, 50 & 63mm pipe.

A hand and/or battery drill reamer/gauging tool is available and must be used after the cutting of the pipe. Internal bending springs in all sizes are also available.

How long does Water Pex™ last?

Artificial ageing tests carried out within the laboratory calculate pipe life at more than 50 years.

What warranty is available with Water Pex™ installation?

Providing the installation is carried out as per the instructions in the Installers Manual, a 15 year installation warranty applies.

Can the Water Pex™ piping system be used for the carriage of hot & cold potable water?

Yes, Water Pex™ complies with AS 4176:2010 and AS2492:2007. Water Pex™ solves many problems associated with metal and other types of plastic pipes. It will not erode, corrode, scale or contaminate water.

Are Water Pex™ fittings interchangeable with gas & water installations?

Yes, all Water Pex™ fittings are the same for hot & cold water, natural gas, LPG and compressed air applications. One DR brass crimped fitting for all applications, just think of the advantages!

Can you use Water Pex™ with other similar systems?

DEFINITELY NOT. Under no circumstance can Water Pex™ pipe or fittings be crimped to other similar systems. If you decide to use a particular composite system for water installations you are strongly encouraged to provide a BSP threaded fitting, in an accessible location to allow for any future extensions by another plumber. In this way you provide a safe means whereby an extension to the water supply, using an alternative composite system, steel or copper can be done. Remember it may be you looking for this fitting.

What is the temperature and pressure rating for the Water Pex™ system?

Materials Applications Service temperatures Maximum working pressure

Can I use Water Pex™ above ground and exposed to sunlight?

Yes, providing the pipe is sleeved with a UV Resistant product. Water Pex UV sleeving is available within our product range.

What is the minimum distance between pipe fixings?

16mm pipe size-fixings to be 1.00 metres apart
20mm pipe size-fixings to be 1.25 metres apart
25mm pipe size-fixings to be 1.50 metres apart
32mm pipe size-fixings to be 2.00 metres apart

The minimum spacing for fixing of composite pipe is not contained in AS 3500.1:2003 Table 5.2 on page 40 so it is recommended that the above date be adopted.

Water Pex™ will not sag between fixings and always look neat and tidy. Water Pex™ do not manufacture fixings for the Water Pex™ system as all existing fixings will suit the Water Pex pipe.
Is there a need to support a bend in the Water Pex™ pipe?

Bend supports are necessary with other systems but not for Water Pex™ PEX/AL/PEX. Once the bend has been made it will stay in place unsupported. Support bends are required for Pex-b.

Can I bend Water Pex™ manually without the aid of a pipe-bender?

Yes, Water Pex™ pipe is very flexible and in the smaller diameter pipe bending can be done by hand. However, when bending large diameter pipe or when a very small radius is required, the use of internal springs is recommended.

Can I fit the Water Pex™ system to an existing copper installation?

Yes, Water Pex™ to copper brazing tails 16, 20 and 25mm and Water Pex™ to copper flairs connectors that have been manufactured in 16mm & 20mm sizes. Simply cut the copper pipe-place the flared nut onto the pipe-flare the pipe then tighten the flared nut to the fitting body. For sizes above 20mm refer to our fitting range contained in the Installer's Manual.

How long has the Water Pex™ system been in use?

The Water Pex™ system has been is use in Australia and overseas for many years.

After cutting Water Pex™ pipe is it necessary to use the reamer/gauging tool every time?

Yes, it is necessary to remove the burred edge after the cutting of the pipe. This will assist in the assembly of the joint and avoid potential damage or dislodgement of the O-rings. The use of the reamer/gauging tool will comply with the warranty requirements.

Are all the threads on the Water Pex™ fittings different to other systems?

All threads on Water Pex™ fittings are either male or female are BSP threads which is a universal thread. The threads on all of our male fittings are tapered and therefore comply with requirements contained in AS 5601 3.2.3 Prohibited fittings on page 25 (running/parallel thread).

In what length is Water Pex™ pipe available?

16mm, 20mm, 25mm & 32mm are available in 5 metre straight lengths and 50 metre coils.

Can I bury Water Pex™ pipe and fittings in the ground?

Yes, the Water Pex™ pipe is completely impervious to water and to attack from under soil organisms. Fittings are also made of DR Brass.

Can Water Pex™ pipes be chased in masonry floor/walls?

Yes, Water Pex™ piping can be chased in masonry floors, walls with no further protection of the pipe necessary.

Can Water Pex™ pipes be buried in concrete?

Yes, without joints, the pipe to be placed between the top and bottom layers of reinforcement.

Can Water Pex™ be installed beneath a building in the ground for water installation?

Yes it can, as long as there are no joints. Don't forget Water Pex™ is available in 50m coils.

Can Water Pex™ pipe be installed in concealed locations such as duct voids etc?

Yes it can, with joints kept to a minimum. Our crimped DR brass joints are classed as permanent joints.

Do I need to use grommets when running Water Pex™ piping through metal studded walls?

The use of grommets is not required as the outer layer of Water Pex™ acts as an insulator in itself. There are saddling clips available that sit in the hole of the metal frame which allows the pipe to pass through them.

Why would I use Water Pex™ rather than some other product?

  • Water Pex™ is the latest system available
  • It is cheaper than copper
  • There is no brazing, no expensive oxy acetylene equipment
  • Light and easy to handle
  • Quick and easy to install
  • One DR crimped brass fitting for all applications
  • Colour coded pipe for quick identification – , blue pipe for cold water, red pipe for hot water, lilac for recycled water and green for rain water
  • Best priced value for money product on the market

Can anyone install Water Pex™?

Installation of water plumbing can only be carried out by a licensed Plumber. Contact your licensed Plumber and ask him to install Water Pex™ for you.

What is the price of Water Pex™?

For details contact your preferred Merchant for the best priced value for money gas and water product on the market.

Where can I buy Water Pex™?

Contact your preferred Merchant or call our Head Office on toll free
1300 761 916

Where can I buy Water Pex™?

Contact your preferred Merchant or call our Head Office on toll free 1300 761 916 or email us HERE


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