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A hospital en-suite wet room seen from the shower, with the floor shown in cut-away: a Green Drain GD-MD sits in the shower's floor drain just below the grate, above the fouled pipe and trap; a toilet and basin on the back wall, and through the open door a nurse and a patient in the room beyond

Green Drain™ GD-MD · Medical Device

The floor drain seal registered as a medical device.

Green Drain GD-MD turns the floor drain, a hidden connection between the room and the drainage system, into a defined, passive and documentable point of control.

Make an inquiry Compliance and documents
  • Class IMDR (EU) 2017/745
  • EUDAMEDSRN DK-MF-000052289
  • ISO 13485:2016Quality system

GD-MD is the medical version of Green Drain, for hospitals, clinics and care facilities. Ask us for a quote.

Ten sizes, from 32 to 157 mm.

Each size fits a range of pipe inside diameters. Lift the grate, measure the pipe below it, and choose the size whose range covers it. Where two ranges overlap, either size fits. Not sure? Ask us.

Green Drain GD-MD125 medical device floor drain seal: teal gasket rings and skirt in a white housing, with the model name and a 1-1/4 in size banner GD-MD125 32 to 38 mm 1-1/4 in nominal Green Drain GD-MD15 medical device floor drain seal: teal gasket rings and skirt in a white housing, with the model name and a 1-1/2 in size banner GD-MD15 39 to 47 mm 1-1/2 in nominal Green Drain GD-MD2 medical device floor drain seal: teal gasket rings and skirt in a white housing, with the model name and a 2 in size banner GD-MD2 51 to 59 mm 2 in nominal Green Drain GD-MD25 medical device floor drain seal: teal gasket rings and skirt in a white housing, with the model name and a 2-1/2 in size banner GD-MD25 55 to 65 mm 2-1/2 in nominal Green Drain GD-MD275 medical device floor drain seal: teal gasket rings and skirt in a white housing, with the model name and a 2-3/4 in size banner GD-MD275 68 to 72 mm 2-3/4 in nominal Green Drain GD-MD3 medical device floor drain seal: teal gasket rings and skirt in a white housing, with the model name and a 3 in size banner GD-MD3 68 to 81 mm 3 in nominal Green Drain GD-MD35 medical device floor drain seal: teal gasket rings and skirt in a white housing, with the model name and a 3-1/2 in size banner GD-MD35 89 to 95 mm 3-1/2 in nominal Green Drain GD-MD4 medical device floor drain seal: teal gasket rings and skirt in a white housing, with the model name and a 4 in size banner GD-MD4 99 to 107 mm 4 in nominal Green Drain GD-MD5 medical device floor drain seal: teal gasket rings and skirt in a white housing, with the model name and a 5 in size banner GD-MD5 125 to 133 mm 5 in nominal Green Drain GD-MD6 medical device floor drain seal: teal gasket rings and skirt in a white housing, with the model name and a 6 in size banner GD-MD6 149 to 157 mm 6 in nominal

Why we make the GD‑MD

Every surface in a care environment has a plan. The floor drain should too.

Healthcare teams clean, check and record the spaces where care happens, every day. One opening in the room is easy to leave out of that routine: the floor drain, a direct connection between the room and the wastewater system beneath it.

We make the GD-MD so that opening can become part of the plan: a passive point of control that a facility can install, inspect and document like everything else in the room. It works alongside the P-trap, the cleaning and the infection prevention and control measures already in place, and it replaces none of them.

We believe no part of a care environment should be left out of the hygiene plan just because it is out of sight.

A hospital en-suite seen from inside the shower, past the curtain, with the shower drain in the floor and a nurse with a patient in the room beyond
Patient shower room
An endoscopy decontamination room with a floor drain in the floor and two staff in gowns at the washer-disinfectors
Decontamination room
A modern hospital production kitchen with tall windows, a stainless island and cook line, a seamless epoxy floor with a round floor drain in the foreground and two cooks in whites at work
Hospital kitchen
A hospital plant room with an air handling unit, a round floor drain in the floor and the unit's condensate line ending over a funnel drain
Plant room

How the GD‑MD works.

A silicone skirt sits inside a rigid housing that seats in the drain pipe below the grate. It works with the P-trap that is already there.

  1. A section drawing of a GD-MD, its silicone skirt open and water falling through it1

    Water flows down.

    The skirt opens under the downward pressure of the water and lets it drain.

  2. The same GD-MD with the flow stopped, the skirt closed across the pipe2

    The flow stops.

    The skirt closes again on its own and forms a physical seal across the pipe.

  3. The same GD-MD closed, with air from the drainage system held below the skirt3

    The drain stays closed.

    The closed skirt restricts the upward movement of air and aerosols from the drainage system. No power, and nothing to operate once it is installed.

>99.9%retention of aerosolised MS2 viral surrogate under controlled laboratory conditions

SGS laboratory testing demonstrated that GD-MD can effectively restrict the upward movement of aerosolised viral-surrogate particles through a drainage opening under the tested conditions.

Independent laboratory evidence supporting passive aerosol-barrier performance: SGS-CSTC, 2025. Tested device performance, not a health outcome. Method and conditions: Technical Summary.

Fits the floor drains you already have.

The GD-MD seats in the outlet pipe below the grate, so the drain body above it can be round, square, a floor sink or a trench. Choose the size by the inside diameter of that pipe.

  • GD-MD4 installed in a round floor drainRound floor drains
  • GD-MD4 installed in a square floor drainSquare floor drains
  • GD-MD4 installed in a floor sinkFloor sinks
  • GD-MD4 installed in a trench drainTrench drains

Intended for floor drain systems in built environments, including healthcare facilities: hospitals, clinics, outpatient facilities, long-term care facilities and other buildings with floor drain systems.

Compliance and documents.

The regulatory facts a procurement, infection prevention or technical review asks for, and the four public documents.

Classification
Class I medical device, MDR (EU) 2017/745
Conformity route
Article 52(7); Annex II Technical Documentation held by the manufacturer
EUDAMED
Registered, SRN DK-MF-000052289
Basic UDI-DI
5745001471GreenDrainMDRJD; every size carries its own UDI-DI
Quality system
ISO 13485:2016 and ISO 9001:2015, with batch-level traceability and change control
Materials
ABS polymer housing, silicone skirt; no natural rubber latex identified
Manufacturer
Green Drain Europe ApS, Herning, Denmark
Supply
On inquiry, for healthcare facilities, distributors and dealers

The regulatory documents, v2.0

EU Declaration of Conformityv2.0 Instructions for Use (IFU)v2.0 Technical Summaryv2.0 Regulatory Summaryv2.0

Issued 14 September 2026. Annex II Technical Documentation is held by the manufacturer and provided to competent authorities on request. All EU MDR documents, the UDI-DI table and what Class I means.

The GD-MD3 24-pack carton, its label side with the CE and MD marks and the size table
24-pack carton
The GD-MD3 unit box, with the size range and the MD mark
Unit box

What the device does, and what it does not

The device does

  • Function as a one-way mechanical barrier in floor drains
  • Restrict the upward movement of air and aerosols from drainage systems
  • Support hygiene and infection prevention and control programs
  • Reduce environmental exposure pathways associated with floor drains

The device does not

  • Prevent, diagnose, treat, or cure disease
  • Make claims about reduction of infection rates or patient outcomes
  • Replace established hygiene protocols or cleaning procedures
  • Have direct or indirect contact with the human body

Green Drain GD-MD is a passive environmental control device. Use it as one element within a broader hygiene management framework.

Install it, then inspect it.

Installed by trained facility staff or a technical service provider, following the Instructions for Use. After that, inspect it from time to time for correct position and condition; reinstall it if it has moved, replace it if you see damage or wear. Passive does not mean unmanaged: each step can be recorded, so the drain has its place in the routine of the facility.

  1. A floor drain in a cut-away floor slab with its grate lifted off
    1

    Lift the grate.

    Remove the existing drain grate.

  2. The open drain with the pipe below the grate, where the seal will sit
    2

    Check the pipe.

    Make sure the pipe below the grate falls in the size range you chose.

  3. The seal being pressed down into the drain pipe
    3

    Press it in.

    Push it into the drain opening and recess it 2 to 4 inches (about 50 to 100 mm) into the pipe, correctly seated and stable.

  4. The grate back on the drain, with the seal seated in the pipe below it
    4

    Replace the grate.

    Put the grate back, close it and fit its screws, where the drain has them.

Questions about the GD‑MD.

How do I order the GD-MD?

The GD-MD is supplied on inquiry to healthcare facilities, distributors and dealers; there is no online purchase. Make an inquiry and tell us the sizes and quantities you need and where they are going.

Which size do I need?

Measure the inside diameter of the pipe below the drain grate, where the seal will sit, and choose the size whose range covers it. The ten sizes run from GD-MD125 (32 to 38 mm) to GD-MD6 (149 to 157 mm); each size page lists its range. Where two ranges overlap, either size fits.

Does the GD-MD replace the P-trap, our cleaning or our infection prevention measures?

No. It works alongside the P-trap that is already in the drain, and alongside cleaning, maintenance and infection prevention and control measures. It does not replace established hygiene protocols, cleaning procedures or infection prevention measures; it adds a passive point of control at the drain opening.

Does the GD-MD reduce infections?

No patient-outcome claim is made. The GD-MD is a passive environmental control device: it does not prevent, diagnose, treat or cure disease. Its evidence supports how the device performs, restricting the upward movement of air and aerosols through the drain opening, as one element within a broader hygiene framework.

Does it need power or maintenance?

It needs no power and no active operation; it works on its own once installed. Inspect it periodically for correct position and condition, remove and reinstall it if it has moved, and replace it if you see damage or degradation. Installation, inspection and replacement can each be recorded.

What is it made of? Does it contain latex?

An ABS polymer housing and a silicone elastomer skirt. No information indicating the presence of natural rubber latex is identified in the available material specifications.

How do we dispose of a used device?

Dispose of it in accordance with local regulations. If contamination, for example biofilm or hazardous substances, is suspected, handle and dispose of it as potentially contaminated waste.

Can facilities outside Europe order the GD-MD?

Yes. Make an inquiry from anywhere and tell us the sizes and quantities you need. Its medical device registration is under the EU Medical Device Regulation. The standard Green Drain line, with its plumbing-code certifications, is also available to order online.

Where are the Instructions for Use?

The Instructions for Use are electronic and published at greendrains.com/gdmd/instructions, the address printed on every box, with a PDF to download. A paper copy is free on request and is sent within 7 calendar days.

Inquire about the GD-MD.

Tell us the sizes and quantities you need and where they are going, and we will come back to you.

Make an inquiry