3.5-4" EG Waterless Trap Seal

Name: GD 3.5-4" EG Waterless Trap Seal
Brand: Green Drain
SKU: GD35-4-EG
Availability: InStock

Extended gasket design bridges 3.5" to 4" drain openings for seamless compatibility across APAC plumbing systems. WaterMark certified.

Pipe Size 3.5-4" (DN 90-100mm)

Flow Rate (U) 85.37 GPM (323.17 LPM)

Install Time 30 Seconds

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WaterMark Certified

ASSE 1072 Tested

International Orders Available

How it works.

The GD 3.5-4" EG features an extended gasket that accommodates pipe diameters from 90 to 100mm, bridging the gap between standard 3.5" and 4" drain openings common in APAC plumbing systems.

Four flexible silicone sealing ribs form a one-way valve. Water passes through under gravity. When flow stops, the ribs close to create a continuous mechanical seal that blocks sewer gas, odors, and pests.

The valve opens under the weight of just 32 grams, approximately 4 oz of water. High-volume wash-down flows up to 85.37 GPM (323.17 LPM) move through without restriction.

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

ASSE 1072 tested. The data that matters.

The GD 3.5-4" EG is tested to ASSE 1072-2020, the North American performance standard for barrier-type floor drain trap seal devices. WaterMark certified for the APAC market.

85.37 GPM (323.17 LPM) Flow Rate (Level U) High-volume capacity for commercial drainage.

32g Opening Force Approx 4 oz. Opens under minimal water weight.

2,500+ Cycle Endurance ASSE 1072 tested open/close cycles.

>96% Evaporation Reduction Keeps trap seal intact without water priming.

Technical Specifications

Model	GD 3.5-4" EG
Pipe Size	3.5-4" (90-100 mm) / DN 90-100
Height	50 mm
Housing Material	ABS Plastic
Valve Material	Silicone Rubber
Seal Material	Silicone Gasket (Extended)
Flow Rate (Level C)	85.37 GPM (323.17 LPM)
ASSE 1072 Opening Force	32 grams
ASSE 1072 Cycle Life	>2,500 cycles
ASSE 1072 Evaporation Reduction	>96%
WaterMark License	WM-022837 (DN100)
Patents	US 7,900,288 · US 9,027,172

Download Spec Sheet (PDF) Download SDS (PDF)

Installs in 30 seconds. No tools.

Remove the drain grate

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

Drop in the GD 3.5-4" EG

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

Press gently to seat

The extended silicone gasket creates a snug seal against the pipe walls.

Replace the grate

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

Where the GD 3.5-4" EG is used.

The extended gasket design bridges 3.5" to 4" drain openings, making this model ideal for APAC plumbing systems across commercial and institutional facilities.

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