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Twin Undersink Water Filter System Housing | 10" x 2.5" with 1/4" Female Ports to 1/4" Tube Connectors | Watermark Certified (GT1-22)
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Twin 10" x 2.5" housings with 1/4" push-fit connectors
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WaterMark Certified with NSF/ANSI 42 compliant materials
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Includes wall mount bracket and opening tool
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Suitable for mains or tank water applications
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Ideal for custom setups or RO system pre/post stages
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Choice of flow direction: Left-to-Right or Right-to-Left
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
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2 × 10" x 2.5" filter housings (white)
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1 × Wall mount bracket (white powdercoated steel)
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1 × Housing opening tool (spanner)
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2 × 1/4" push-fit fittings
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Flow direction option: Left-to-Right (standard) or Right-to-Left
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Filters sold separately
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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.
| Specification | Details |
|---|---|
| Dimensions | 36H x 24W x 13D (cm) |
| Port Size | 1/4" |
| Fitting Size | 1/4" Push-Fit |
| Installation | Undersink (wall mount bracket included) |
| Certifications | WaterMark Certified AS 3497:2021 |
| Standards | NSF/ANSI 42 Compliant, AS 3707, AS 4020 |
Return Policy
Due to the nature of the products we sell, a strict return policy is in place. We work with food grade certified materials that must be un-opened and un-used as to be able to be re-sold.
You may receive a refund or credit of equal amount, less the restocking fee if applicable and any other deductions that are relevant.
- Wrongly purchased items may be returned for a merchandise credit, this applies for but not limited to: Wrong size, wrong system etc.
- 30 Day return Policy: Returns will not be accepted without prior approval or after 30 days of invoice date.
- All returns will incur a 17.5% restocking fee or cost to send the item to you whichever greater. FSA may use discretion to determine the restocking fee.
- Any damages (minor, that can be repaired) will incur a fee which will be deducted from the total refund which will be equal to the cost of the replacement
parts (List Price) and labour charge (if applicable) to repair the system(s). This will be separate to the restocking fee. - Any damage considered to be major and not feasible for repair may be refused and the return request will be void. The customer will be responsible for the return freight or disposal of the damaged unit.
- Return shipping is to be paid by the buyer to the address provided. It is recommended that the customer applies transit warranty to the return freight in case of damage.
- Any damages to the system that were not reported to FSA within 48 business hours of receipted delivery are not covered under our transit warranty.
- Should the item appear faulty or doesn’t work how described, the unit/item must be returned for testing (if requested), the return postage paid by the buyer. If the unit/item is deemed to be faulty, compensation will be provided for the postage cost (Proof of cost required). If the unit/item is deemed to be in working order and as described, the buyer will responsible for return postage.
If you have any questions about our return policy, please contact us before purchase. This will also help to ensure you purchase the correct product that suits your requirements.