METRIC, British Thread Water Meter Flow, Cold Water 3/4inch (1inch) BSP Meters 4,0 m3/h METRIC METER (measure in cubic meters); BRITISH STANDARD THREADS USED: Cubic meters measurement; Maximum flow rate: 4,0 m3/h; 3/4" male BSP European Thread with possibility of removing adaptor and switch to 1" male BSP European Thread Resistant to strong external magnetic field; Easy reading of the water meter counter; Hermetic counter (with increased tightness) resistant to steaming; Protection against tampering;