Green Drain GD15 waterless trap seal for 1.5-inch drains

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GD15

1.5" Waterless Trap Seal

Name: GD15 - 1.5" Waterless Trap Seal
Brand: Green Drain
SKU: GD15
Price: 34.95 USD
Availability: InStock

Fits 1.5" (39-47 mm) drain outlets. Drop-in install, no tools required.

$34.95

Free shipping on all US orders

Pipe Size 1.5" (39-47mm)

Flow Rate 51.55 L/min

Install Time 30 Seconds

Add to Cart Request a Quote

Will it fit? Measure the pipe opening under the cover, inside wall to inside wall.

Watch how to measure Size chart

Measuring keychain $6.95A cutout for every size, so you order the right one.

Size chart

Measure the pipe opening inside wall to inside wall, then find the row your reading falls in. Go by the millimeters: the inch size is only the pipe’s name.

Model	Pipe opening	Size
GD125	32 to 38 mm	1.25"
GD15 this page	39 to 47 mm	1.5"
GD2	51 to 59 mm	2"
GD25	55 to 65 mm	2.5"
GD3	68 to 81 mm	3"
GD35	89 to 95 mm	3.5"
GD4	99 to 107 mm	4"
GD5	125 to 133 mm	5"
GD6	149 to 157 mm	6"
International models, by quote
GD3/35	77 to 95 mm	3 to 3.5"
GD35/4	89 to 108 mm	3.5 to 4"

Full measuring guide

cUPC Listed

ASSE 1072 Compliant

Free US Shipping

For hospitals and clinics: GD-MD, the medical version of this size.

Inspect the seal around 6 to 12 months in service to confirm the silicone is still intact and sealing properly. Replace only as needed: high-use drains wear sooner, while low-use drains often last a year or longer.

Cutaway view of a 1.5-inch drain and its trap

How it works.

Green Drain is a one-way valve for your 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 1.5-inch drains and drops in by hand. No tools, no plumber, installed in seconds.

Will it fit? Measure first

Measure the pipe. Not the strainer, not the drain body.

Lift the strainer. Under it is a round pipe opening. Measured across its center from inside wall to inside wall, that is the only number that matters. The GD15 seats in a pipe of 39 to 47 mm (1.5 in.). If the opening is oval, use the smaller reading. Outside that range, another size fits: see all sizes.

Shower drain in section with the strainer highlighted: not the part to measure

Don't measure the strainer

The strainer is the round cover in the shower floor. It sits on top of the drain body and is wider than the pipe underneath, so its width tells you nothing about fit.

Shower drain in section with the drain body highlighted: not the part to measure

Don't measure the drain body

The drain body is the housing set into the floor under the strainer. It is wider than the pipe too. The Green Drain does not sit here.

Shower drain in section with the pipe highlighted: the part to measure

Measure the pipe

At the bottom of the drain body is the round pipe opening. This is where the Green Drain seats, so this is the width to measure. Wipe it clean, then measure inside wall to inside wall.

Shower drain from above with the strainer off: a tape across the pipe opening from A to B — **Measure A to B.** The pipe opening under the strainer.

How to Measure and Install a GD15. Measure first, then install. Jump to either part below the video.

Full installation guide: how to measure, choose a size and install.

Common drains it fits

GD15 installed in a shower drain — Shower

GD15 installed in a square-grate shower drain — Square shower

Not seeing your drain? If its outlet is a round pipe in the GD15's range, it fits. The cover on top does not matter; the pipe under it does. Remove any basket or strainer first.

GD15 in section with water flowing down through the open skirt — **Water flowing.** The silicone skirt opens and water passes.

GD15 in section with the skirt closed and sewer gas held below — **Flow stopped.** The skirt closes. Air, odor and insects stay below.

The valve, two states

One-way. Opens for water going down, closes when the flow stops. No water to top up, no power, nothing to prime.

Inspect the seal around 6 to 12 months in service and replace only as needed.

Installs in 30 seconds. No tools.

Step 1: the strainer lifted off a shower drain, shown in section

Lift the strainer

Most strainers lift straight out by hand. Some are held by one center screw; back it out, then lift.

Step 2: measuring the pipe opening at the bottom of the drain, inside wall to inside wall

Measure the opening

Measure the pipe opening under the strainer, inside wall to inside wall. The GD15 fits 39 to 47 mm (1.5 in.).

Step 3: the GD15 being pressed down into the pipe opening

Press gently to seat

Recess 2 to 4 inches below the pipe top. The silicone gasket creates a snug seal against the pipe walls.

Step 4: the strainer back in place over the seated GD15

Replace the strainer

Put the strainer back. Done. Fully sealed in under a minute.

Watch the install for the GD15 It starts at 0:53 in the video above.

For Architects & Engineers

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.

Download Revit Families View full specifications →

Technical Specifications

Model	GD15
Pipe Size	1.5" (39-47 mm)
Height	30 mm
Housing Diameter (no gasket)	36.46 mm (1.435")
Housing with Gasket	48.77 mm (1.920") wide x 30.18 mm (1.188")
Housing Material	ABS Plastic
Valve Material	Silicone Rubber
Seal Material	Silicone Gasket
Flow Rate	51.55 L/min
WaterMark License	WM-022837 (DN40)
Patents	Multiple US & international patents

Industries we serve.

The GD15 fits anywhere a 1.5" (39-47 mm) drain connection is present.

Residential Hotels & Hospitality Property Management Commercial Properties

Certifications and compliance.

Green Drain holds six product certifications (cUPC, WaterMark, NSF/ANSI 2, CE / ETA-18/0536, Saber, and HACCP International). The remaining items below are independent test reports and compliance declarations that support those listings.

cUPC Listed

IAPMO File 9301

ASSE 1072-2020 Standard

Barrier-type trap seal performance standardEvaluated under IAPMO R&T cUPC File No. 9301

CE / ETA-18/0536

European Technical Assessment

NSF/ANSI 2

Food Equipment Certified

HACCP International

Food safety certification (Certificate RG-05)

WaterMark Australia

WM-022837 (DN40)

Prop 65 Compliant

Compliance declaration: California material safety

SGS

SGS Aerosol-Retention Test

Test report: retained over 99.9% of an aerosolized MS2 bacteriophage viral surrogate

DTI Tested

Independent test report: Rapport 957187

IAPMO R&T

Certifying body: issues the cUPC listing (File 9301)

VA Godkendelse

Danish plumbing approval (declaration)

View All Certifications

For architects and engineers.

Write the GD15 into a specification by name. Its spec sheet puts the dimensioned plan and section views, the engineering specification paragraph, performance data and listings on one page. The spec pack adds every model, with the certificates and test reports.

Spec Section 22 13 19

Basis of Design Green Drain GD15, IAPMO File 9301

Patents Multiple US & international patents

Download the GD15 spec sheet Download the full spec pack

PDF. Spec sheet: 1 page. Spec pack: 72 pages, 12 MB. See every model's specifications

The GD15 spec sheet in front of the Green Drain Product Specification Pack

Ready to protect your drains?

Drop-in install. No tools. Works from day one.

Add GD15 to Cart Request a Quote

1.5" Waterless Trap Seal

How it works.

Measure the pipe. Not the strainer, not the drain body.

Installs in 30 seconds. No tools.

Lift the strainer

Measure the opening

Press gently to seat

Replace the strainer

Specify Green Drain in your next project.

Technical Specifications

Industries we serve.

Certifications and compliance.

cUPC Listed

ASSE 1072-2020 Standard

CE / ETA-18/0536

NSF/ANSI 2

HACCP International

WaterMark Australia

Prop 65 Compliant

SGS Aerosol-Retention Test

DTI Tested

IAPMO R&T

VA Godkendelse

For architects and engineers.

Related products.

GD125 (1.25")

GD2 (2")

GD3 (3")

Ready to protect your drains?