King of compression – the Conex Bänninger rib-nut


14 June 2023


When it comes to compression the versatile Conex Compression fittings stand out from the crowd ensuring a permanently tight and secure connection without the need for sealant.

Launched in the 1950s, the uniquely designed rib-nut is tightened by a Conex compression spanner and it continues to be the leading brand in compression today.

Guaranteed against manufacturing defects for 25 years, the fittings are easy to use and provide compactness, strength, grip and effortless engagement. No hot works are required – they provide a permanent flame-free connection and are corrosion resistant.

Manufactured from high-quality brass materials, the unique compression rib-nut can be used in a wide variety of domestic and commercial applications making it a truly versatile product. Its applications are many-fold including hot-or-cold drinking water, heating, solar and gas.

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The unique ribbed cap-nut design allows tube versatility. This includes copper (to EN 1057), carbon steel (to EN 10305), stainless steel (to EN 10312) and plastic pipes (to BS EN 7291, EN 15875 and EN 15876)

The Conex Compression joint is based on the principle of compressing a spherical brass ring – formerly known as a cone – between two differing tapers in the cap-nut and fitting. 

When the cap-nut is tightened to secure the joint, the compression ring changes form resulting in a perfect two-point seal that indents the tube on both sides of the contact.

Ged Grimes, UK and Ireland Business Unit Director, comments: “This seal ensures the compression joint can withstand pressures well in excess of those that it would be exposed to in normal usage.”

For more information on Conex Bänninger’s complete range of fittings and valve solutions, visit: