¾ inch pipe threads (US NPT, which that item has) have an OD of 1.05 inches. (26.67mm)
The thread pitch is 14 turns per inch.
ANSI B1.20.1 - NPT - American National Standard Taper Pipe Threads
About 4 years ago, forum user Jon Murphy acquired some gear via a forum member
in the UK who “liquidated” (for lack of a better term) several “emonTH/flow meter” setups because
the project fell apart. (Ref: Free: EmonDHW setups for monitoring hot water use - #17 by markocoheat)
I bought one of them from Jon. When I saw the flow meter, my first thought was the threaded ends
appeared like they might fit a standard US garden hose. (¾ inch fittings/11.5 TPI) They didn’t.
The size was very close, if not the same, but the thread pitch was not.
So even if the size were to match what the OP needs, the thread pitch might be a show stopper.
