Because the water comes out of the spout at an angle see the picture unless a you train all users to only turn the water on a little or b turn down the pressure at the angle stops guest bath in my house and no way ill be able to warn all the guests water shoots out at the angle and over the sides of the sinkif you decide you must have this unitto remove the faucet handles from the faucet valves remove the bluered color temp designators carefully so as not to break them next install the nipple onto the spout use teflon tape even though there is an oring

Install teflon tape onto the exposed end of the nipple and the threaded ends of the t

Install water lines from valves to t

Align square bases for the valves and spout and install handles onto the valves