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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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

🛠️Finned design for easy install

🇨🇭Swiss-made quality

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$U973

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Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚽 Seal the deal with Swiss precision and effortless style!

EFFORTLESS INSTALLATION - Innovative finned design lets you snap it in place quickly—no plumber needed.
LEAK RESISTANT RUBBER SEAL - Premium rubber cone ensures a watertight seal, preventing costly leaks and water damage.
SEAMLESS 40 MM COMPATIBILITY - Perfectly engineered for 40mm concealed bends, ensuring a leak-proof connection every time.
TRUSTED SWISS CRAFTSMANSHIP - Genuine Geberit product, crafted in Switzerland for unmatched durability and reliability.
UNIVERSAL FIT FOR CONCEALED BENDS - Works flawlessly with 51mm x 42/44mm concealed flush bends, making upgrades hassle-free.

The Geberit Internal Low Level Flush Pipe Rubber Cone Seal is a high-quality, Swiss-made plumbing fitting designed for 40mm concealed bends. Featuring a finned design for easy installation and a durable rubber cone seal, it guarantees a secure, leak-proof connection for your WC pan. Trusted by professionals and DIYers alike, this genuine Geberit product combines precision engineering with reliable performance.

Specifications

ASIN	B00KONDA8C
Best Sellers Rank	36,964 in DIY & Tools ( See Top 100 in DIY & Tools ) 129 in Toilet Parts
Brand	Geberit
Connector Type	Press
Customer Reviews	4.4 4.4 out of 5 stars (289)
Exterior Finish	Rubber
Inlet Connection Size	4E+1 Millimeters
Inlet Connection Type	Press
Manufacturer	Geberit
Material	Plastic
Model Number	37
Outlet Connection Size	4E+1 Millimeters
Outlet Connection Type	FNPT
Part Number	37
Set Name	119.668.00.1
Size	40 mm
Smart Home Compatibility	Not Smart Home Compatible
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

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