On 07/05/2021 15:31, David wrote:
Wearing my "long time since I did this" hat.

I have a connector kit to join two water butts.

The diameter of the non-threaded bit is 24mm.
Outer diameter of the thread is 25.64 mm.

So do you cut the hole to be a tight fit (24 mm) and expect the connector
to cut a thread which seals, or do you cut for a loose fit (25 mm or even
26 mm)so the connector just slides in and the seal is on the mating faces
with the water butt plastic?

I'm about to go shed diving again, but the cutters at Screwfix are 25mm
which might be a hint.

Cheers



Dave R


Depends on the materials of the water butt and the connector kit, and
whether or not the butt has a suitable surface finish to make a seal
with the supplied seal.