What is a 3-way tap? Simply, a 3-way tap - also known as a triflow - is a tap with a water purification system. The system produces hot and cold water that can been filtered for any impurities making it as nice to drink as a bottle of Evian. See the three handles below? /div> (P.S. If youre looking for it on Sinks.co.uk, look for Phoenician with filtration kitchen tap in chrome.)