M18x1 x M22x1 male M18x1 male x M22x1 male M18 often is used from companies such as Hansgrohe, Axor, also for Bidet resilient version You can measure the M18 with a ruler. Its exactly 18 Millimeters from one side to the other side of the thread. 18 Millimeters are 0,71 inch. But beware, there are also other metric threads out there, like M16.5 or M17
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