Ah!
The other replies explain something that happened to me the week
before last. I needed a bath plug around 42/43mm. I bought some in
Tescos on the strength of the label, and found that they were actually
the wrong size, 5-10mm too big.
I took them back and brandished a tape measure to 'prove' my point,
but I guess they must have been marked with these notional historical
sizes.
Downright confusing to the layman though. Perhaps we should mark
plumbing fittings in two sizes, actual and notional historical.
On Sat, 06 Apr 2013 22:34:14 +0100, Frederick Williams
<
freddyw...@btinternet.com> wrote:
> I have just bought four tap washers from B&Q. They are made by Plumb
> SURE and labelled "tap washers 3/4". They are 1" in diameter. Are they
> wrongly labelled or is it that I don't know how tap washers are
> dimensioned? What I want is a tap washer 3/4" in diameter. What should
> I buy?
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