The most common commercial floor drain size. 89.8 GPM flow capacity. Drop-in install, no tools required.
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Four flexible silicone sealing ribs form a one-way valve. Water passes through under gravity. Even high-volume wash-down flows up to 89.8 GPM move through without restriction.
When flow stops, the ribs close to create a continuous mechanical seal that blocks sewer gas, odors, and pests from entering the occupied space above.
The valve opens under the weight of just 32 grams, approximately 4 oz of water. The flexible design accommodates pipe diameters from 102 to 110 mm.
Independently tested by IAPMO R&T. These are lab-verified results from an accredited third-party testing laboratory.
| Model | GD4 |
| Pipe Size | 4" (102-110 mm) / DN100 |
| Height | 51 mm |
| Housing Diameter (no gasket) | 88.39 mm (3.480"), bottom 93.47 mm (3.680") |
| Housing with Gasket | 108.56 mm (3.274") wide x 50.7 mm (1.996") |
| Housing Material | ABS Plastic |
| Valve Material | Silicone Rubber |
| Seal Material | Silicone Gasket |
| Flow Rate (Level C) | 218.25 L/min |
| Flow Rate (Level U) | ≥340.00 L/min |
| ASSE 1072 Flow (IAPMO) | 73 GPM |
| ASSE 1072 Opening Force | 32 grams |
| ASSE 1072 Cycle Life | >2,500 cycles |
| ASSE 1072 Evaporation Reduction | >96% |
| Flow Capacity (DTI) | 73 GPM (1.4 L/s) |
| Pressure Resistance (DTI) | >400 Pa |
| WaterMark License | WM-022837 (DN100) |
| Patents | US 7,900,288 · US 9,027,172 |
Lift the existing drain grate or strainer from the floor drain body.
Place the Green Drain into the drain body or hub opening.
The silicone gasket creates a snug seal against the pipe walls.
Put the grate back. Done. A full commercial floor in an afternoon.
Handy accessories for Green Drain owners.
Purpose-built for quick, clean removal of any Green Drain. Simply hook and lift.
$6.95
Identify drain sizes in the field. Measure the inside diameter to find the right model.
$6.95
The 4" floor drain is the most commonly specified drain size in new commercial construction. The GD4 appears in virtually every commercial vertical.
IAPMO File 9301
Trap seal performance standard
European Technical Assessment
Food Equipment Certified
Certificate RG-04
WM-022837 (DN80)
California Material Safety
>99.9% blockage of viral aerosols
Rapport 957187
Certified Testing Lab
Danish Plumbing Approval
"4 months have gone by and I have yet to have a single complaint or concern since the Green Drains were installed."
"Once installed the Green Drain solved our issues. No more need to flush the drains or add enzymes. This product really works!"
"We have used the following product in all of our bathroom drains, and this has not only eliminated our odor problem, but it has made our internal customers safer."
The GD4 is the model most commonly written into construction specifications. For CSI-format spec language, ASSE 1072-2020 performance data, and the complete certification matrix, see the Architects and Engineers technical page.
Drop-in install. No tools. Works from day one.
