Foam for Sealing Compressor Air Line

[Arrenite]

Hi folks, my sewage treatment plant manufacturer says to use a foam to seal the air lines at either end of the air hose going from my air compressor to the plant. Cann anyone please tell me what type of foam to use. Cheers !
 

Arenite

[SteamyTea]

Difficult one.

Can you post a picture up?

 

You may find that a non foaming  flexible PU adhesive is better than expanding foam.

[Russell griffiths]

Mine came with a bit heavy duty black neoprene type bung that had a hole pre cut in the centre

a bit of a tight fit that I rammed inside the duct.