a 3/4" male thread connects to a 3/4" female thread. The size name of the fitting denotes the size of pipe it takes - e.g. a 25mm socket end will take a 25mm pipe. Inch size names do not measure the same as an inch on a ruler.
Description
PN10 WP, WRAS approved
(suitable for potable water)
Parallel sockets like these are used to connect to the threaded side of our tank connectors.