Convert Plain 25 Litre FV Lid to Airlock and Grommet

[Barley Rubble]

I am considering converting one or possibly two of my three plastic 25 litre FV's from plain solid lids to airlocks and grommets. Can I confirm that 13 mm is the correct drill size to use to the standard grommet and airlock? Secondly, does it matter where the hole is drilled? centre or towards the edge?

Thanks,
Barley.

 

[Cheshire Cat]

9.5 millimetres hole and don't drill too close to the edge

 

[Barley Rubble]

9.5 millimetres hole and don't drill too close to the edge

Thanks for that CC. I will drill half way between centre and edge.

 

[Chippy_Tea]

I used to drill a 9 mm hole so as to get a tight fit, if you can get hold of a step drill 28 mmm will allow you to use a standard bung.

 

[Clint]

On the couple I've done I found it useful to go slow and have something behind it you don't mind drilling into as the first seemed to go a bit wonky although it still works.

 

[Chippy_Tea]

I agree Clint those step drills are a bit fierce.

 

[Clint]

...I used a "small" spade bit I had knocking about...

 

[Chippy_Tea]

...I used a "small" spade bit I had knocking about...

Brave man.