Section
3.5-4" Waterless Trap Seal
Extended gasket design bridges 3.5" to 4" drain openings for seamless compatibility across international plumbing systems. WaterMark certified.
How it works.
Green Drain is a one-way valve for your floor drain. Water flows down and out. Nothing comes back up.
Inside sits a soft silicone valve. Running water pushes it open; the moment the water stops, it closes and seals tight against sewer gas, odors, and pests. Because it seals with silicone instead of water, it never dries out the way an ordinary trap can, even when the drain goes weeks without use.
It fits 3.5 to 4-inch drains, 90 to 100 mm, and drops in by hand. No tools, no plumber, installed in seconds.
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 GD35/4
Place the Green Drain into the drain body or hub opening.
Press gently to seat
Recess 2 to 4 inches below the pipe top. 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.
ASSE 1072 tested. The data that matters.
The GD35/4 is tested to ASSE 1072-2020, the North American performance standard for barrier-type floor drain trap seal devices. WaterMark certified (Australia).
Specify Green Drain in your next project.
Download the Revit family set for every Green Drain model, and find us listed in BSD SpecLink and MasterSpec.
Technical Specifications
| Model | GD35/4 |
| 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 | 323.17 L/min |
| ASSE 1072 Opening Force | 32 grams |
| ASSE 1072 Cycle Life | >2,500 cycles |
| ASSE 1072 Evaporation Reduction | >96% |
| WaterMark License | WM-022837 (DN100) |
| Patents | Multiple US & international patents |
Industries we serve.
The extended gasket design bridges 3.5" to 4" drain openings for compatibility across international plumbing systems.
Certifications and compliance.
WaterMark Australia
WM-022837 (DN100)
ASSE 1072-2020 Standard
Barrier-type trap seal performance standardEvaluated under IAPMO R&T cUPC File No. 9301
HACCP International
Food Safe Equipment endorsement (RG-04)
NSF/ANSI 2
Food Equipment Certified
SGS Aerosol-Retention Test
Retained over 99.9% of an aerosolized MS2 bacteriophage viral surrogate
DTI Test Report
Danish Technological Institute, Rapport 957187
Interested in this product?
Contact our team for international orders and distributor inquiries.