Problem

The drain is a direct
path into your building.

With no use, the water in a P-trap evaporates within two to four weeks and the barrier is gone, leaving an open path for gases.

☠️
H₂S, methane, ammonia
Toxic and flammable sewer gases travel through the dry trap. H₂S is toxic at 10 ppm and fatal at 100 ppm.
🦠
Pathogenic and viral aerosols
23 documented hospital outbreaks linked to drains (Carling, 2018). CRE, MRSA, Pseudomonas — direct route through the drain. Green Drain™ has been proven to block >99.9 % of viral aerosols.
📉
Negative reviews and guest complaints
There is a direct correlation between odour and a drop in ratings on Booking and TripAdvisor. Every negative review deters guests from booking again.

Floor drain without a trap — pests and gases pass through freely.

Carling et al. — Am. J. Infect. Control, 2018

documented hospital outbreaks linked to sink and floor drains

CRE

Carbapenem-resistant enterobacteria

MRSA

Methicillin-resistant Staphylococcus

VRE

Vancomycin-resistant Enterococcus

Others

Pseudomonas aeruginosa

Product

Green Drain™
One-way silicone valve.

Medical-grade silicone rubber. Four flexible ribs that adapt to any drain diameter. No glue, no expensive tools.

30 seconds

Tool-free installation

~5 years

Expected service life

11 sizes

32 mm – 152 mm

0 litres

Annual water consumption

Green Drain™ — cross-section of a one-way silicone valve with installed protection

Need a quote? Direct B2B supply — available immediately, fast delivery across Ireland and Northern Ireland.

Request samples →

Evidence

It is not a marketing claim.
Independently verified by SGS.

>99.9 %

Viral aerosols blocked
SGS Report QDF25-0049810-01

Organisation

SGS S.A. — the independent Swiss testing and certification group

Service-life test

ASSE 1072-2020 · 2500+ usage cycles

Certificates

SGSHACCPNSFCEcUPCASSEEU MDR 2017/745

SGS Control Group (without Green Drain™)

18,000–72,500

PFU of viral particles detected above the drain

SGS with GD 3 installed

Less than 5 PFU

Below the detection threshold · all 3 test circuits

Laboratory

SGS-CSTC
CNAS L0604 accreditation

Surrogate: MS2 bacteriophage (ATCC 15597-B1)

93×

Silicone strength above minimum (CRT Lab)

International certifications · 7 independent laboratories

2,500

ASSE cycle · 32 g opening force (IAPMO)

1,500+

Thermal cycles without degradation (DTI)

One-way silicone valve

Block ↑

Sewer gasesH₂S, methane, ammonia
Viral aerosols99.9 % SGS
Bacteria and biofilmCRE, MRSA, Pseudomonas
Pests and odoursFlies, cockroaches and sewer odour

Green
Drain™

Allows

Full water flowGD1.25: 29.22 L/min · GD6: ≥550 L/min
Easy cleaningRinse with warm water as needed.
Floor washdownHandles washdown water without clogging.
Drain maintenanceQuick and easy removal

>99.9 %

SGS · 58 studies · 2500+ ASSE · 14 certificates

SGSHACCPNSFCEEU MDR 2017/745

Solution	Blocks	Aerosols	Water per year	Service
Green Drain™	✓ always	✓ >99.9 %	0 litres	30 seconds
P-trap	Dries out	No	Variable	Regular refilling

How does it work?

Physics, not chemistry.
Permanent protection.

Four silicone ribs hold the seal without glue. The weight of the water opens the valve. With no water, it stays shut. Always.

At rest — closed

Gravity keeps the valve closed. An absolute barrier. It doesn't evaporate, it doesn't dry out.

When washing — open

The weight of the water opens the valve and ensures full flow.

Service — 30 seconds

Remove it without tools, rinse it under warm water and refit it.

Long term — proven in industrial conditions

Medical-grade silicone rubber. 2500+ ASSE cycles.

ASSE 1072-2020 · IAPMO 1554-25004

Request an audit → Research library

▶ Video demonstration

Fitted in 30 seconds. See for yourself.

Lift the grate, drop the seal into the drain body, put the grate back. That is the whole job. No plumber, no tools, no adhesive and no pipework — and the seal works from the first second.

11 models.
Every drain covered.

Model	Diameter	Flow	Height	Application
GD 1.25 →	1.25″ / DN32	29.22 L/min	26 mm	Condensate drains, shower channels
GD 1.5 →	1.5″ / DN40	51.55 L/min	28 mm	Shower drains, traditional P-traps
GD 2 →	2″ / DN50	82.50 L/min	33 mm	Residential buildings, hospitality
GD 2.5 →	2.5″ / DN65	72.50 L/min	35 mm	Showers, urinals, floor drains
GD 3 →	3″ / DN80	105.70 L/min	51 mm	Showers, urinals, floor drains
GD 3–3.5 →	3–3.5″ / DN80-90	105.70 L/min	50 mm	Commercial kitchens, traditional P-traps
GD 3.5 →	3.5″ / DN90	323.17 L/min	51 mm	Public washrooms, showers
GD 3.5–4 →	3.5–4″ / DN90-100	323.17 L/min	50 mm	Industrial kitchens, hotels, public washrooms, showers
GD 4 →	4″ / DN100	≥340 L/min	51 mm	Food service kitchens, commercial drains
GD 5 →	5″ / DN125	391 L/min	42 mm	Industrial floor drains, urinals
GD 6 →	6″ / DN150	≥550 L/min	51 mm	Commercial kitchens, manufacturing, airports

Not sure which size you need? Send a photo of the drain — free model recommendation.

Ask us for advice →

Industries

Every environment
needs protection.

Green Drain™ in 8 key sectors — every size, every trap and the EU regulatory framework.

Hotels and resorts

General protection across guest bathrooms, the wellness area and F&B. The seal holds through seasonal closures — no dried-out traps in empty rooms.

Learn more →

Hospitals and clinics

EU MDR Class I barrier for IPC programmes. Passive protection of ICUs, operating rooms, and isolation units against H₂S and aerosols.

Learn more →

Restaurants and kitchens

HACCP-compliant CCP for drain contamination. Mechanical barrier against fruit flies in kitchen floors.

Learn more →

Food industry

EU 1935/2004 food-safe. CCP for drainage contamination in plants, cold storage facilities, and packing houses.

Learn more →

Airports

Thousands of terminal gullies sealed with no need for constant water flow. The seal holds through night-time low-flow periods.

Learn more →

Schools and halls

A seven-week summer break dries out every P-trap. Green Drain™ stays sealed right through it — no flushing round in September.

Learn more →

Industry and warehouses

H₂S and methane barrier for worker safety. ATEX-compliant design, resistant to CIP/SIP processes.

Learn more →

Nursing homes

Protection of immunocompromised patients from H₂S, viruses, and bacterial aerosols from drains. EU MDR documentation.

Learn more →

Detailed sector guide: 18 industries with size recommendations, EU certifications, and the EU regulatory framework.

All industries → Free audit

Testing

Seven laboratories,
four continents.

Green Drain does not self-certify performance. Aerosol retention, flow, pressure resistance, membrane durability and chemical resistance were all tested by independent accredited laboratories — every figure has a numbered report.

276 L/min

GD4 flow over 10 minutes
IAPMO · ASSE 1072-2020

200 Pa

Odour tightness, no pressure drop
DTI 226049

93×

Above the tear-strength minimum
CRT Laboratories

>99.9%

MS2 surrogate retention
SGS QDF25-0049810-01

The >99.9% figure was measured against a viral surrogate (MS2) under laboratory conditions. The protocol and its limits are set out on the testing page.

All reports and laboratories →

EU MDR 2017/745 · Medical device

Green Drain™ is a
Class I medical device
under EU MDR.

A one-way floor drain valve classified as a Class I medical device under Regulation (EU) 2017/745. Conformity is self-declared by the manufacturer under Annex IV — for Class I devices that are non-sterile and have no measuring function, no notified body is involved. Manufactured under ISO 13485:2016.

🏥

Class I

Classification
MDR risk

EUDAMED

Manufacturer SRN
DK-MF-000052289

⚙️

ISO 13485

Production under
medical QMS

🌍

27 EU countries

Covered
EU Declaration of Conformity

✓ Green Drain™

✓

Acts as a one-way mechanical barrier in floor drains.

✓

Blocks the upward flow of air and aerosols from the sewer network.

✓

Supports infection prevention and control (IPC) programmes.

✓

Reduces pathways of exposure to pathogens through floor drains.

✗ Green Drain™

✗

Does not prevent, diagnose, treat, or cure diseases.

✗

Does not guarantee a reduction in infection rates or clinical outcomes.

✗

Does not replace established hygiene and disinfection protocols.

✗

Does not come into direct or indirect contact with the patient's body.

Why MDR Class I?

Green Drain™ is non-invasive, non-sterile, and without measurement functions — does not come into contact with the body. According to Annex VIII of the MDR classification rules, this places it in the lowest risk level.

Despite the low risk class, manufacturing runs under ISO 13485:2016 — medical device standards — including traceability by lot and change control.

EUDAMED SRN

DK-MF-000052289

Basic UDI-DI

5745001471GreenDrainMDRJD

Certification

ISO 13485:2016 + ISO 9001:2015

Publicly available regulatory documents

EU Declaration of Conformity

Declaration of Conformity

Signed declaration of conformity to MDR 2017/745 — all 8 variants

↓ Download PDF

IFU

Instructions for use

Intended use, installation, warnings, materials, traceability

↓ Download PDF

Technology

Technical summary

For architects, engineers, and IPC consultants — ASSE, ETA, QMS

↓ Download PDF

Regulatory

Regulatory summary

An explanation of the MDR status in simple language for non-technical stakeholders

↓ Download PDF

Economic operators and regulatory information

ManufacturerGreen Drain (greendrains.com). Conformity information is taken from the manufacturer's documentation.

DistributorGREEN FLOW d.o.o., Savska cesta 41, 10000 Zagreb, Croatia, OIB 92557545052 — distributor within the meaning of Article 14 of Regulation (EU) 2017/745.

ClassificationClass I under Annex VIII of Regulation (EU) 2017/745. Conformity is self-declared by the manufacturer under Annex IV; no notified body is involved and no third-party MDR certificate exists.

Two CE marksCE under Regulation (EU) 2017/745 (medical devices) and, separately, CE under Regulation (EU) 305/2011 (construction products, ETA-18/0536). These are two distinct regimes.

Before useRead the manufacturer's instructions for use. We send the IFU and the Declaration of Conformity on request: info@greenflow.ie.

Incident reportingReport a suspected defect or incident to info@greenflow.ie. We keep a complaints register and forward reports to the manufacturer and the competent authority.

Installation

Installed in
30 seconds.

No plumber. No tools. No fixings. A whole building in an afternoon.

7-day free trial

We come out and fit samples at the critical points. You judge the results. No cost, no obligation.

Drain identification

Send us a photo or a list of your drains and we will identify what you have, free of charge.

Measure the diameter — choose a model

Internal diameter of the pipe (not the grate).

Drop-in — 30 sec/each

The silicone ribs grip without glue. Thirty seconds per drain.

Annual review — that's all

A silicone membrane and nothing to service. No maintenance contracts.

Step 1

Take off the grate.

Remove the existing grate or strainer from the drain.

Step 2

Insert Green Drain™

Lower the seal 5–10 cm into the drain body for optimal flow.

Step 3

Press into place

The silicone ribs conform to the drain and lock in place. It works immediately.

Step 4

Refit the grate

Done. Thirty seconds' work, lasting protection.

FAQ

Frequently asked questions.

Yes. Green Drain is available in 11 sizes from 1.25″ to 6″ with a ±2 mm tolerance thanks to its silicone ribs. It fits every standard drain.

No. Drop-in design — just drop it into the drain. No tools, no glue. 30 seconds per drain.

No, Green Drain allows full water flow.

Expected service life is about 5 years according to ASSE 1072-2020 (2500+ cycles · IAPMO 1554-25004). Medical-grade silicone resistant to chemicals and to temperatures from −40 °C to +100 °C.

Green Drain is especially effective here. A standard P-trap dries out within two to four weeks of disuse, while Green Drain stays sealed without water — ideal for seasonal facilities.

Yes — we come to the site and leave samples for 7 days free of charge. You decide. No cost, no obligation.

There is no minimum order for B2B. Order as much as you need.

Ideally 5–10 cm below the top of the pipe. The silicone ribs compress for a snug fit — no glue.

In most cases, no — Green Drain is a removable fitting that does not alter the plumbing. For commercial properties, check local regulations.

Yes. The medical-grade silicone has been tested at –40 °C (no brittleness) and 100 °C (hot water, steam). It is chemically resistant to sulphuric acid, NaOH, and standard disinfectants according to CRT laboratory testing.

Green Drain™
Patented protection
for floor drains.

The drain is a direct
path into your building.

Green Drain™
One-way silicone valve.

It is not a marketing claim.
Independently verified by SGS.