Big Blue Water Filter Housing - WaterMark Certified 20" x 4.5" Dual O-Ring 8-13HD

Product Code: GT8-13HD

Availability: In Stock Ships In 1 Day!

Availability: In stock


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USA Patented | Watermark Certified

These Water Filter Housings are certified to WaterMark Standards AS/NZS 3497 Under the Certificate number 23247.

WaterMark certification is the level of certification required by law for a licensed plumber in Australia to install a water filter system. All products used under this certification will give you peace of mind knowing that your water filter complies with Australian plumbing codes.

Our WaterMark certified filter systems are hand assembled here in Australia and are randomly batch tested to ensure top quality and workmanship for your water filtration products.

Pressure Gauge

When selected, these housings will be supplied with a 1/4" hole on the outlet side to accommodate the pressure gauge. The inlet side of the housing cap will have the standard PRV (Red Button).

When you do not select to buy a pressure gauge, the housing will be supplied without the pressure gauge hole.

Size: 20" x 4.5" (Big Blue)
Use: Suitable for use outdoors due to its UV resistant design, suitable for all water filtration including Town water, rain water, bore, creek & River Water.
Ports: 1"



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 will receive a credit of equal amount, less the postage cost to send it to you. 

  • 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: We will accept returns up to 30 days after the initial purchase, all orders should be checked immediately for damage/fault upon arrival to aid us with the return process.
  • Return shipping is to be paid by the buyer to the address provided
  • 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. If the unit/item is deemed to be in working order and as described, the buyer will need to pay 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.


Additional Information

Product CodeGT8-13HD
Product TypeWater Filter

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