Twin Undersink Water Filter Kit 10" x 2.5" | 1/4" Ports (GT1-22)

The GT1-22 Twin Undersink Water Filter Kit is a versatile and certified twin housing system designed for mains or rainwater applications. With dual 10" x 2.5" housings and convenient 1/4" push-fit connectors, this unit is perfect for replacing existing housings or building a custom water filtration setup — including use in pre- or post-filtration for Reverse Osmosis (RO) systems.

This unit suits both standard left-to-right and alternate right-to-left flow configurations, offering full compatibility with various installations. It is hand-assembled in Australia, designed for reliability, and built using materials that meet strict plumbing and drinking water safety standards.

Whether you’re configuring a new undersink system or replacing an existing filter kit, the GT1-22 is built for quality, compliance, and ease of integration.

Kit Contains

• 2 × 10" x 2.5" filter housings (white)

• 1 × Wall mount bracket (white powdercoated steel)

• 1 × Housing opening tool (spanner)

• 2 × 1/4" push-fit fittings

• Flow direction option: Left-to-Right (standard) or Right-to-Left

• Filters sold separately

• Optional: Leak Shut-Off Valve or Pressure Limiting Valve (PLV)

WaterMark Certification

This system is WaterMark Certified to AS 3497:2021 under Certificate Number 23247 – the mandatory certification standard required for any water filter system installed by a licensed plumber in Australia.

WaterMark certification ensures your system complies with Australian plumbing regulations, giving you confidence that every component meets strict safety and quality requirements. Our WaterMark-certified systems are hand-assembled in Australia and undergo batch testing to ensure consistent quality and workmanship.

This certification covers not only the structural integrity of materials under pressure, but also mandates that all components – including filters – comply with relevant health-based standards such as NSF/ANSI 42 or higher.

⚠️ Beware of non-certified systems – using uncertified water filters can pose health risks and may lead to voided insurance claims under Australia's Plumbing and Drainage Laws.

Installation Note:
Unless this filter is replacing an existing Twin Filter System, this system must be installed by a licensed plumber in accordance with Australian Standards (AS 3497). You can simply order online with free shipping to your home, and any local licensed plumber will be able to complete the installation. Full installation instructions are included in the box.