Vacuum system: Can anyone recognize the brand?

Hello everyone,

I have a photo of a central vacuum system, but I can't tell which brand it is. Maybe someone is familiar with the brands and can guess which one it is.

I want to start looking for new connection sockets (the previous owner painted them ugly). They must definitely be from the same manufacturer.

Thanks.

Ask the previous owner? :)

Is there no type designation on the cans (inside the lid)?