Heat exchangers / heating

That one is high flow but is 4inch so you'd need to adapt down to 70mm which is the size of the pipe at the front where it joins the bottom of the totem pole. The one in my link above is 3inch (75mm) so not such a step.

 

Pack it well with blue asbestos

 

That's funny - they said the same thing. Spooky!

 

Give it a good rub between your hands before stuffing it in