Monoblock bath fillers only require a single hole to be drilled in the bath to be mounted. Monobloc Bath filler taps are basically a larger version of a monobloc basin mixer but with a larger flow allowing the bath to be filled quicker. Monobloc bath filler taps often allow you to position a bath filler tap in positions you wouldn't be able to with a more traditional 2 hole deck filler bath taps, so you might just find a monobloc bath tap is a great option for your bathroom.