27/08/2026
🏠 HIDDEN PLUMBING LEAK: The dreaded Dux Quest strikes again! 🛠️
We recently tackled a tricky job where our client noticed water seeping straight through their exterior cladding.
To find the source, we carefully removed the weatherboard to expose the wall cavity. Tucked away inside was the culprit: a leaking Dux Quest pipe.
If you own a home built or renovated in New Zealand between 1978 and 1987, this is a must-read. Dux Quest was a popular plumbing choice during that major building boom, but it has since become a known hazard for Kiwi homeowners.
🕵️♂️ How to identify Dux Quest pipes:
• Material: Black (or sometimes grey) polybutylene plastic.
• Markings: Look for faded white lettering along the side reading "Dux Quest" or "Qest Dux".
💥 Why are they failing?
The plastic material simply doesn’t hold up over time. It reacts with the chlorine in standard tap water, causing the pipes to become extremely brittle. This leads to frequent pinhole leaks, or worse, sudden and catastrophic bursts behind your walls.
Because the damage happens hidden from view, a leak like the one our client experienced is often the first warning sign.
Don't wait for water to damage your framing and cladding. If you suspect your home still has original late-70s or 80s plastic plumbing, it's time to get it checked.
📲 Want peace of mind? Send us a message or call us to book a plumbing inspection or discuss re-piping options today!