In message , at 16:52:42 on Sat, 2 May
2020, Andy Burns remarked:
Roland Perry wrote:

Measuring once around the circumference gives me 75mm, so a diameter
of ~23.8mm hence probably 0.918"

So he knows he needs a 7lb lead connector to whatever size MDPE, the
instruction "The fitting can not be over tightened"

"Is impossible to" vs "must not be" ?

probably sounds like "challenge accepted" to a plumber :-)

--
Roland Perry