Today deck mounted bath mixer filler taps are what is classed as the standard form of bath filler tap. Deck mounted taps are attached to your bath mounting edge via mouting holes dilled into the bath. Depending on the bath this may be in the centre of the bath, one of the ends of the bath, or even the corner of the bath. Unlike bath pillar taps, bath mixer taps have a single spout and mix the hot and cold water in the valve.