"Scott M" wrote in message
...
Stephen wrote:

I measured it with a vernier calliper and I think it was 28.5mm, which
seems an awkward size. Rounding that up to 29mm, I could not find any
29mm spanners anywhere. Would a 30mm spanner be too big or do you
"cheat" and use adjustable ones?

I always end up with Stilsons when plumbing

Stilsons are for pipes only - not fittings!!!