When a flue analysis point is not accessible for example if there is a wall obstructing access.  The Right Angled Flue Gas Analyser Probe Adaptor fits on ANY boiler flue.  
It also has 4 options, which accommodates ALL domestic and commercial analysers.

This product has an option of 6mm, 7mm, 8mm and 10mm probe size.

It can be used with Kane, TPI, Testo, Anton, Rothenburger and Sauermann.  

This is a protected design.