The 20A valve operates at 6 litres a min / 60 litres max at 0.6 bar with max pressure at 7.5 bar.

Commercial sites other public places take great care in keeping their patients and customers safe by ensuring that sinks, taps, urinals and showers are kept clean.

However, have you ever stopped to consider that the sink and shower are attached to an open sewer in that the drains from sinks and showers are only protected by a “U-bend”,  of which that pipework is connected to the drains and the toilet waste pipe!