Waterless Trap Seals for Australian Drain Sizes. Free Shipping Over $100 AUD
Green Drain GD25 waterless trap seal for 2.5-inch floor drains
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APAC Exclusive GD25

2.5" Waterless Trap Seal

Designed specifically for Australian 2.5" (DN65) drain standards. Residential and light commercial floor drains, shower drains, utility drains. Drop-in install, no tools required.

$54.20 AUD

Inc. GST. Free shipping on orders over $100 AUD. $10 flat rate standard shipping.

Pipe Size 2.5" (63-65mm)
Flow Rate 72.50 L/min
Install Time 30 Seconds
WaterMark Certified
ASSE 1072 Tested
Free Shipping Over $100

How it works.

Four flexible silicone sealing ribs form a one-way valve. Water passes through freely under gravity. When flow stops, the ribs close to create a continuous mechanical seal. No water required.

The GD25 is sized specifically for Australian 2.5" (DN65) drain standards, accommodating pipe diameters from 63 to 65 mm. This size sits between the GD2 and GD3 and is not available outside Australia.

Drop-in installation. No tools. No plumber.

Green Drain cross-section diagram showing one-way valve open during flow and closed to block sewer gas and pests

Technical Specifications

ModelGD25
Pipe Size2.5" (63-65 mm) / DN65
Height~35 mm
Housing MaterialABS Plastic
Valve MaterialSilicone Rubber
Seal MaterialSilicone Gasket
Flow Rate72.50 L/min
WaterMark LicenseWM-022837 (DN65)
AvailabilityAPAC Exclusive
PatentsMultiple US & international patents

Installs in 30 seconds. No tools.

1
Step 1: Remove the drain grate

Remove the drain grate

Lift the existing drain grate or strainer from the floor drain body.

2
Step 2: Drop in the Green Drain

Drop in the GD25

Place the Green Drain into the drain body or hub opening.

3
Step 3: Press gently to seat

Press gently to seat

Recess 2 to 4 inches below the pipe top. The silicone gasket creates a snug seal against the pipe walls.

4
Step 4: Replace the drain grate

Replace the grate

Put the grate back. Done. A full commercial floor in an afternoon.

Where the GD25 is used.

The 2.5" floor drain is specific to Australian plumbing standards. The GD25 serves residential and light commercial applications across a range of building types.

Certifications and compliance.

Green Drain WaterMark Australia certification WM-022837

WaterMark Australia

WM-022837

Green Drain ASSE 1072-2020 barrier-type trap seal certification

ASSE 1072-2020

Trap seal performance standard

Green Drain HACCP International food safety endorsement

HACCP International

Certificate RG-04

Green Drain NSF/ANSI 2 food equipment certification

NSF/ANSI 2

Food Equipment Certified

SGS

SGS Pathogen Test

>99.9% blockage of viral aerosols

Green Drain tested by Danish Technological Institute DTI

DTI Tested

Rapport 957187

Ready to protect your drains?

Drop-in install. No tools. Works from day one.