Frederick Williams 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?

I have just found some Texas washers in the bottom of a tool box
labelled 1/2", they are 3/4" in diameter and fit perfectly.

--
When a true genius appears in the world, you may know him by
this sign, that the dunces are all in confederacy against him.
Jonathan Swift: Thoughts on Various Subjects, Moral and Diverting