How it works.
Four flexible silicone sealing ribs form a one-way valve. Water and debris pass through under gravity. Commercial wash-down volumes, mop water, and kitchen runoff all drain normally.
When flow stops, the ribs close to create a continuous mechanical seal that blocks sewer gas, odours, and pests from entering the occupied space above.
The GD 3-3.5" EG features an extended gasket that accommodates pipe diameters from 75 to 90mm, bridging the gap between standard 3" and 3.5" drain openings common in Australian plumbing systems.
