About Kahlenberg UK

Kahlenberg UK Ltd is the European distributor for Kahlenberg Industries, Inc. providing full European support and local stock for Kahlenberg marine and industrial air horns, sound signals, controllers, air compressors and the company's other products.

Please contact us for further assistance at or on +44 (0)1635 35353

Sound signal legal requirements

IMO COLREGs bookWhile countries across Europe will have local laws that apply to ship and boat navigation, there is a common requirement worldwide for all leisure, commercial and military vessels to conform to the IMO International Regulations for Preventing Collisions at Sea. As Steve Austin, Senior Policy Lead at the UK Maritime & Coastguard Agency (MCA) explains: "The COLREGs apply to all vessels, there is no differentiation between coded and non-coded vessels. Should the whistles prove not to conform then they will need to be modified or changed."

"Whistles should conform to the performance in COLREGs, Appendix III and the appropriate parts of IEC 60945 to EN60945 which deal with the marine operating environment."

All Kahlenberg products meet or exceed these requirements. Many other new and currently installed sound signals are non-compliant and might be breaching maritime law and invalidating insurance cover.

Kahlenberg replating and refurbishment service

marine air horn rechrome refurbishRestore your Kahlenberg marine air horn to its original look, lustre and sound by using Kahlenberg UK Ltd’s refurbish and restoration service.

The marine environment is known for its harshness. Surface finishes are attacked by salt air and sea spray. Despite careful cleaning and polishing, finishes can eventually deteriorate to the point of needing refurbishment.

The restoration process is not just a matter of re-chroming. To ensure your Kahlenberg boat or superyacht horn is restored to its original as new state the horn is dismantled and re-manufactured in its entirety, before final testing in an anechoic chamber and the issuing a new certificate proving IMO compliance.


The Kahlenberg chrome plating process is unique, having been developed over the years specifically to combat the corrosive marine environment. This is one area where employing cheap. less competent options will prove to be a false economy.


Marine horn refurbishment process

The process we follow ensures IMO compliancy and offers peace of mind.


  • The horn is fully disassembled to the last nut and bolt
  • Any part beyond restoration is replaced with new
  • All plating is chemically stripped
  • Each part is sanded and buffed to return them to a mirror finish
  • The first stage of plating begins with a layer of copper followed by another buffing
  • Next, the parts undergo a duplex nickel plating and chrome plating process
  • All interior surfaces of the horn sounding body are re-machined to their original factory tolerances
  • The sounding diaphragms are replaced
  • The horn is re-assembled, inspected, tested for full function, and re-certified to meet compliance with the IMO ColRegs


Re-machining the trumpets to the correct tolerances ensures that the correct frequencies and Kahlenberg ‘sound’ are maintained. The parts used in all Kahlenberg marine sound signals are high quality and can often be re-employed but any parts requiring complete replacement will be recycled. The unique Kahlenberg plating process ensures the horns will stay bright and look good for a long time.

Certified IMO compliant

When your horn is returned, it will come with a new IMO certificate of compliance. You can relax in the knowledge that you have, in effect, a brand new horn that will give many years of great looks and sound.

Further information

Call Kahlenberg UK now on +44 (0)1635 35353 or email