Gerhard, thanks for such a full response with detail about compressor operation that I did not know. I really like to understand the machines I use to that 'how they work' level as it helps me to make the most of them and use them safely.

Really good to know that it could froth up my beer. Now that's what I call a very useful and versatile machine. Think I will try to master its other uses first though.

Thanks again for taking the time to assist me with this.

Regards

Ian