what size hole saw bit do I need for an o2 bung to fit in a downpipe?

input is much appreciated

 

i think i used a 1", but i also used a nut for a bung

 

Just go buy a step bit, and keep drilling untill you reach the size you need.

 

step bits FTW harbor frieght has them cheap

 

+1

 

13/16 - 7/8"

 

Harbor Freight step bits do not last long when drilling 304 stainless.

 

Good thing they are cheap then. Buy a handful.

 

yup its like 3 dollars for a 3 pack im going there here in alittle bit im going to buy another home brewery kit

 

HF step bits and some vatozone anti foulers cut down and wire wheeled and you have a 2 o2 bungs (they sell them in sets) and a bit for under $10.

O2 bungs on the cheap. :P

But I do always chase my O2 bungs with a tap after I weld them. And I also weld them with a old spark plug in to keep it from ------- up the threads too bad.