Fitting identification

[Zopkios]

I need to reposition this Sensus water meter but the 3/4 inch copper pipe on both the inlet and outlet is too short. Rather than heating up each fitting to remove the stubs, I would prefer to replace each fitting with new in the new arrangement. My problem is that I don't know how to identify the fitting. The water meter itself appears to have 1 inch males, but going into each fitting is 3/4 inch copper pipe. So what is the part description or catalog number of the fitting?

 

[Ric2013]

Female iron? Or more likely a tap connector? (British terms)

 

[snowhead]

Water meter coupling or water meter union.
They're specific to water meters as they can have an anti tamper seal fitted to them to prove removal has taken place.

 

[Ric2013]

Water meter coupling or water meter union.

Good shout, thanks. To be honest, the photo does not look to me to be 1" threads, so my suggestion was probably misguided!