Inlets supplied with connectors for 15mm copper. 35mm diameter hole required. When fittings are installed on unbalanced pressures it may be necessary to restrict the inlet with the higher pressure to prevent excessive flow. Check valves must be fitted on mixers where supplies are unbalanced. Flow rate with fitted regulator 5 litres per minute. Unregulated flow rate 6.5 litres per minute at 0.1 bar.