The part I received (correctly labelled as 119.668.00.1) has an internal diameter of approx 38mm not 42mm. Is this correct?

It should stretch over the flushpipe to give a tight fit.

witch way dose the seal fit

The seal will indeed fit into the WC pan either way round BUT it is designed to accommodate the flush pipe from one end only. The seal needs to be fitted over the end of the flush pipe (there is a stop to prevent the pipe being pushed right through the seal) then the pipe/seal assembly fitted into the socket in the back of the WC pan. As I recall, a little liquid soap on the external fins of the seal will help it to slide into the ceramic pan socket.

What are the dimensions if this is it 40mm internal?

The grammar of your question means I am not exactly clear what you are asking. The product page description seems to cover the details of the various dimensions. The overall diameter of the fins on the outside of the seal is 60mm which I understand means it will fit the socket in the back of a normal, ceramic, WC pan. (It fits my Ideal Standard Back-to-the-Wall WC pan OK) The clear internal diameter is 42mm intended to accommodate the lower end of the Geberit "L" shaped flush pipe. This pipe is 50mm o/d at its inlet (Geberit cistern) end and 45mm o/d at its outlet (WC pan) end. It is this 45mm o/d end that fits into the seal, which in turn fits into the WC pan. I can offer no further details.

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Geberit Internal Low Level Flush Pipe Rubber Cone Seal for 40mm Concealed Bend 119.668.00.1

Product ID: 50109802

Details

Brand
Geberit
Exterior finish
Rubber
Inlet connection size
4E+1
Inlet connection type
Press
Material
Plastic
Number of Packs
1

🔧Precision 40mm fit

🧩Compatible with 51x42/44mm bends

🛠️Finned design for quick install

€ 14.24

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Description

🚿 Seal the deal with Geberit precision and never worry about leaks again!

COMPACT CONCEALED - Slim 60mm flush pipe cone fits discreetly, maintaining sleek bathroom aesthetics.
DURABLE RUBBER SEAL - Premium rubber material guarantees long-lasting, watertight reliability under pressure.
EFFORTLESS INSTALLATION - Innovative finned design lets you snap it in place with zero hassle—save time on every job.
TRUSTED GEBERIT QUALITY - Genuine product from a top-tier brand, backed by thousands of 4.5-star reviews.
SEAMLESS 40 MM COMPATIBILITY - Engineered for perfect fit with concealed bends, ensuring leak-proof performance.

The Geberit Internal Low Level Flush Pipe Rubber Cone Seal (40mm) is a high-quality, durable rubber gasket designed for concealed flush bends measuring 51mm x 42/44mm. Featuring a finned design for easy installation and manufactured by Geberit, this seal ensures a secure, leak-proof connection for WC pans, combining reliability with professional-grade engineering.

Specifications

ASIN	B00KONDA8C
Best Sellers Rank	35,592 in DIY & Tools ( See Top 100 in DIY & Tools ) 128 in Toilet Parts
Brand	Geberit
Connector Type	Press
Customer Reviews	4.5 out of 5 stars 298 Reviews
Exterior Finish	Rubber
Exterior finish	Rubber
Inlet Connection Size	4E+1 Millimeters
Inlet Connection Type	Press
Inlet connection size	4E+1 Millimeters
Inlet connection type	Press
Manufacturer	Geberit
Material	Plastic
Model Number	37
Number of Items	1
Number of Packs	1
Number of Pieces	1
Outlet Connection Size	4E+1 Millimeters
Outlet Connection Type	FNPT
Outlet connection type	FNPT
Part Number	37
Set Name	119.668.00.1
Size	40 mm
Specification Met	DIN
Thread Size	40 Milímetros
Thread Type	us m/asia
UPC	519313124889 791429024899
Unit Count	1.0 count
Valve Type	Flush Pipe Rubber cone Seal

Reviews

C**S

It did what it was ment to do

Always liked this type

4.01.2026

I**H

Good

Good Seal

28.07.2026

G**S

It worked for me

Used to attach a Geberit water feed pipe to a wc . Worked perfectly . Delivered on time

5.08.2025

R**Y

Good Value

Fixed a leaking toilet connector quickly and easily

26.11.2025

F**K

Easy fit , perfect

Brilliant 🤩 thought I had pushed it in too far but seal was perfect, definitely recommended 👍

15.01.2026

C**G

Great seal. Exactly as discribed

My pipe was a 40mm and fitted perfectly in. It was a snug fit into the pan and took a bit more or a shove to get in than my old seal. Leak gone after fitting this. Will be buying again if it ever needs replacing.

26.09.2021

C**L

Plug

Good product

27.09.2021

J**R

Sealed the deal 🤭

Again A1 delivery of top quality part

8.10.2025

A**E

Original Geberit, Artikel.

Es ist ein Original Kibrit Artikel, nur meiner Ansicht nach zu teuer.

14.09.2025

U**.

Passt für Geberit Spülkästen und Standardbecken

Verschleissteil, passt. Ob z.B. eine Dichtung aus Silikonmaterial deutlich länger halten würde, als dieses Gummi? Würde die Reparaturintervalle deutlich verlängern.

2.01.2025

M**W

Geberit

Ware in Ordnung

19.02.2024

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€ 14.24

Duties & taxes included

In stock

Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to France.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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